mirror of https://github.com/schoebel/mars
brick_mem: improve debugging
This commit is contained in:
parent
9799fe5417
commit
c45f2da80c
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@ -48,6 +48,16 @@ config MARS_DEBUG_MEM
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many errors (including some that are not caught by kmemleak).
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Use only for development and thorough testing!
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config MARS_DEBUG_MEM_STRONG
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bool "intensified debugging of memory operations"
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depends on MARS_DEBUG_MEM
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default y
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---help---
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Trace all block allocations, find more errors.
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Adds some overhead.
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Use for debugging of new bricks or for intensified
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regression testing.
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config MARS_DEBUG_ORDER0
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bool "also debug order0 operations"
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depends on MARS_DEBUG_MEM
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@ -13,6 +13,7 @@
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#include "brick_say.h"
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#include "brick_locks.h"
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#include "lamport.h"
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#include "buildtag.h"
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#define USE_KERNEL_PAGES // currently mandatory (vmalloc does not work)
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@ -214,6 +215,32 @@ EXPORT_SYMBOL_GPL(_brick_mem_free);
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// string memory allocation
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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# define STRING_CANARY \
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"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
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"yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy" \
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" \
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"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
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"yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy" \
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" \
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"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
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"yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy" \
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" \
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" BUILDTAG = " BUILDTAG \
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" BUILDHOST = " BUILDHOST \
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" BUILDDATE = " BUILDDATE \
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" FILE = " __FILE__ \
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" DATE = " __DATE__ \
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" TIME = " __TIME__ \
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" VERSION = " __VERSION__ \
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" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx STRING_error xxx\n"
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# define STRING_PLUS (sizeof(int) * 3 + sizeof(STRING_CANARY))
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#elif defined(BRICK_DEBUG_MEM)
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# define STRING_PLUS (sizeof(int) * 4)
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#else
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# define STRING_PLUS 0
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#endif
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#ifdef BRICK_DEBUG_MEM
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static atomic_t phys_string_alloc = ATOMIC_INIT(0);
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static atomic_t string_count[BRICK_DEBUG_MEM] = {};
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@ -226,24 +253,18 @@ char *_brick_string_alloc(int len, int line)
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#ifdef CONFIG_MARS_DEBUG
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might_sleep();
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if (unlikely(len > PAGE_SIZE)) {
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BRICK_WRN("line = %d string too long: len = %d\n", line, len);
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}
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#endif
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if (len <= 0) {
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len = BRICK_STRING_LEN;
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}
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#ifdef BRICK_DEBUG_MEM
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len += sizeof(int) * 4;
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#endif
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#ifdef CONFIG_MARS_MEM_RETRY
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for (;;) {
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#endif
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#ifdef CONFIG_MARS_DEBUG
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res = kzalloc(len + 1024, GFP_BRICK);
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#else
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res = kzalloc(len + 1, GFP_BRICK);
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#endif
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res = kzalloc(len + STRING_PLUS, GFP_BRICK);
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#ifdef CONFIG_MARS_MEM_RETRY
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if (likely(res))
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break;
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@ -253,6 +274,9 @@ char *_brick_string_alloc(int len, int line)
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#ifdef BRICK_DEBUG_MEM
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if (likely(res)) {
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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memset(res + 1, '?', len - 1);
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#endif
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atomic_inc(&phys_string_alloc);
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if (unlikely(line < 0))
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line = 0;
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@ -261,9 +285,13 @@ char *_brick_string_alloc(int len, int line)
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INT_ACCESS(res, 0) = MAGIC_STR;
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INT_ACCESS(res, sizeof(int)) = len;
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INT_ACCESS(res, sizeof(int) * 2) = line;
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INT_ACCESS(res, len - sizeof(int)) = MAGIC_SEND;
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atomic_inc(&string_count[line]);
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res += sizeof(int) * 3;
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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strcpy(res + len, STRING_CANARY);
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#else
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INT_ACCESS(res, len) = MAGIC_SEND;
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#endif
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atomic_inc(&string_count[line]);
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}
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#endif
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return res;
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@ -276,6 +304,7 @@ void _brick_string_free(const char *data, int cline)
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int magic;
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int len;
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int line;
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char *orig = (void*)data;
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data -= sizeof(int) * 3;
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magic = INT_ACCESS(data, 0);
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@ -285,16 +314,34 @@ void _brick_string_free(const char *data, int cline)
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}
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len = INT_ACCESS(data, sizeof(int));
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line = INT_ACCESS(data, sizeof(int) * 2);
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if (unlikely(len <= 0)) {
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BRICK_ERR("cline %d stringmem corruption: line = %d len = %d\n", cline, line, len);
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return;
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}
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if (unlikely(len > PAGE_SIZE)) {
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BRICK_ERR("cline %d string too long: line = %d len = %d string='%s'\n", cline, line, len, orig);
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}
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if (unlikely(line < 0 || line >= BRICK_DEBUG_MEM)) {
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BRICK_ERR("cline %d stringmem corruption: line = %d (len = %d)\n", cline, line, len);
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return;
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}
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magic = INT_ACCESS(data, len - sizeof(int));
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if (unlikely(magic != MAGIC_SEND)) {
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BRICK_ERR("cline %d stringmem corruption: end_magix %08x != %08x, line = %d len = %d\n", cline, magic, MAGIC_SEND, len, line);
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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if (unlikely(strcmp(orig + len, STRING_CANARY))) {
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BRICK_ERR("cline %d stringmem corruption: bad canary '%s', line = %d len = %d\n",
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cline, STRING_CANARY, line, len);
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return;
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}
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INT_ACCESS(data, len - sizeof(int)) = 0xffffffff;
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orig[len]--;
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memset(orig, '!', len);
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#else
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magic = INT_ACCESS(orig, len);
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if (unlikely(magic != MAGIC_SEND)) {
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BRICK_ERR("cline %d stringmem corruption: end_magix %08x != %08x, line = %d len = %d\n",
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cline, magic, MAGIC_SEND, line, len);
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return;
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}
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INT_ACCESS(orig, len) = 0xffffffff;
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#endif
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atomic_dec(&string_count[line]);
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atomic_inc(&string_free[line]);
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atomic_dec(&phys_string_alloc);
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@ -345,8 +392,78 @@ static int alloc_line[BRICK_MAX_ORDER+1] = {};
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static int alloc_len[BRICK_MAX_ORDER+1] = {};
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#endif
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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#define MAX_INFO_LISTS 1024
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#define INFO_LIST_HASH(addr) ((unsigned long)(addr) / (PAGE_SIZE * 2) % MAX_INFO_LISTS)
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struct mem_block_info {
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struct list_head inf_head;
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void *inf_data;
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int inf_len;
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int inf_line;
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bool inf_used;
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};
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static struct list_head inf_anchor[MAX_INFO_LISTS];
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static rwlock_t inf_lock[MAX_INFO_LISTS];
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static
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void _new_block_info(void *data, int len, int cline)
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{
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struct mem_block_info *inf;
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int hash;
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for (;;) {
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inf = kmalloc(sizeof(struct mem_block_info), GFP_BRICK);
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if (likely(inf))
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break;
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msleep(1000);
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}
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inf->inf_data = data;
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inf->inf_len = len;
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inf->inf_line = cline;
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inf->inf_used = true;
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hash = INFO_LIST_HASH(data);
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write_lock(&inf_lock[hash]);
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list_add(&inf->inf_head, &inf_anchor[hash]);
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write_unlock(&inf_lock[hash]);
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}
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static
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struct mem_block_info *_find_block_info(void *data, bool remove)
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{
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struct mem_block_info *res = NULL;
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struct list_head *tmp;
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int hash = INFO_LIST_HASH(data);
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if (remove)
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write_lock(&inf_lock[hash]);
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else
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read_lock(&inf_lock[hash]);
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for (tmp = inf_anchor[hash].next; tmp != &inf_anchor[hash]; tmp = tmp->next) {
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struct mem_block_info *inf = container_of(tmp, struct mem_block_info, inf_head);
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if (inf->inf_data != data)
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continue;
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if (remove)
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list_del_init(tmp);
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res = inf;
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break;
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}
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if (remove)
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write_unlock(&inf_lock[hash]);
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else
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read_unlock(&inf_lock[hash]);
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return res;
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}
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#endif // CONFIG_MARS_DEBUG_MEM_STRONG
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static inline
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void *__brick_block_alloc(gfp_t gfp, int order)
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void *__brick_block_alloc(gfp_t gfp, int order, int cline)
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{
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void *res;
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#ifdef CONFIG_MARS_MEM_RETRY
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@ -365,6 +482,9 @@ void *__brick_block_alloc(gfp_t gfp, int order)
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#endif
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if (likely(res)) {
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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_new_block_info(res, PAGE_SIZE << order, cline);
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#endif
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#ifdef BRICK_DEBUG_MEM
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atomic_inc(&phys_block_alloc);
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atomic_inc(&raw_count[order]);
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@ -376,13 +496,31 @@ void *__brick_block_alloc(gfp_t gfp, int order)
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}
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static inline
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void __brick_block_free(void *data, int order)
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void __brick_block_free(void *data, int order, int cline)
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{
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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struct mem_block_info *inf = _find_block_info(data, true);
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if (likely(inf)) {
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int inf_len = inf->inf_len;
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int inf_line = inf->inf_line;
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kfree(inf);
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if (unlikely(inf_len != (PAGE_SIZE << order))) {
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BRICK_ERR("line %d: address %p: bad freeing size %d (correct should be %d, previous line = %d)\n", cline, data, (int)(PAGE_SIZE << order), inf_len, inf_line);
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goto err;
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}
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} else {
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BRICK_ERR("line %d: trying to free non-existent address %p (order = %d)\n", cline, data, order);
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goto err;
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}
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#endif
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#ifdef USE_KERNEL_PAGES
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__free_pages(virt_to_page((unsigned long)data), order);
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#else
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vfree(data);
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#endif
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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err:
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#endif
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#ifdef BRICK_DEBUG_MEM
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atomic_dec(&phys_block_alloc);
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atomic_dec(&raw_count[order]);
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@ -406,7 +544,7 @@ static void *brick_freelist[BRICK_MAX_ORDER+1] = {};
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static atomic_t freelist_count[BRICK_MAX_ORDER+1] = {};
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static
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void *_get_free(int order)
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void *_get_free(int order, int cline)
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{
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void *data;
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unsigned long flags;
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@ -422,8 +560,8 @@ void *_get_free(int order)
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// prevent further trouble by leaving a memleak
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brick_freelist[order] = NULL;
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traced_unlock(&freelist_lock[order], flags);
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BRICK_ERR("freelist corruption at %p (pattern = %lx next %p != %p, murdered = %d), order = %d\n",
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data, pattern, next, copy, atomic_read(&freelist_count[order]), order);
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BRICK_ERR("line %d:freelist corruption at %p (pattern = %lx next %p != %p, murdered = %d), order = %d\n",
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cline, data, pattern, next, copy, atomic_read(&freelist_count[order]), order);
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return NULL;
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}
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#endif
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@ -431,6 +569,21 @@ void *_get_free(int order)
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atomic_dec(&freelist_count[order]);
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}
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traced_unlock(&freelist_lock[order], flags);
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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if (data) {
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struct mem_block_info *inf = _find_block_info(data, false);
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if (likely(inf)) {
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if (unlikely(inf->inf_len != (PAGE_SIZE << order))) {
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BRICK_ERR("line %d: address %p: bad freelist size %d (correct should be %d, previous line = %d)\n",
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cline, data, (int)(PAGE_SIZE << order), inf->inf_len, inf->inf_line);
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}
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inf->inf_line = cline;
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inf->inf_used = true;
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} else {
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BRICK_ERR("line %d: freelist address %p is invalid (order = %d)\n", cline, data, order);
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}
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}
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#endif
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return data;
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}
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@ -461,10 +614,10 @@ void _free_all(void)
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int order;
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for (order = BRICK_MAX_ORDER; order >= 0; order--) {
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for (;;) {
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void *data = _get_free(order);
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void *data = _get_free(order, __LINE__);
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if (!data)
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break;
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__brick_block_free(data, order);
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__brick_block_free(data, order, __LINE__);
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}
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}
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}
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@ -483,7 +636,7 @@ int brick_mem_reserve(void)
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max = brick_mem_freelist_max[order] - atomic_read(&freelist_count[order]);
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if (max >= 0) {
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for (i = 0; i < max; i++) {
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void *data = __brick_block_alloc(GFP_KERNEL, order);
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void *data = __brick_block_alloc(GFP_KERNEL, order, __LINE__);
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if (likely(data)) {
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_put_free(data, order);
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} else {
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@ -492,9 +645,9 @@ int brick_mem_reserve(void)
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}
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} else {
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for (i = 0; i < -max; i++) {
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void *data = _get_free(order);
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void *data = _get_free(order, __LINE__);
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if (likely(data)) {
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__brick_block_free(data, order);
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__brick_block_free(data, order, __LINE__);
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}
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}
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}
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@ -559,11 +712,11 @@ void *_brick_block_alloc(loff_t pos, int len, int line)
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#endif
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#ifdef CONFIG_MARS_MEM_PREALLOC
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data = _get_free(order);
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data = _get_free(order, line);
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if (!data)
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#endif
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data = __brick_block_alloc(GFP_BRICK, order);
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data = __brick_block_alloc(GFP_BRICK, order, line);
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#ifdef BRICK_DEBUG_MEM
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if (likely(data) && order > 0) {
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if (unlikely(line < 0))
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@ -593,7 +746,12 @@ EXPORT_SYMBOL_GPL(_brick_block_alloc);
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void _brick_block_free(void *data, int len, int cline)
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{
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int order;
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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struct mem_block_info *inf;
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char *real_data;
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#endif
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#ifdef BRICK_DEBUG_MEM
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int prev_line = 0;
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#ifdef BRICK_DEBUG_ORDER0
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const int plus0 = PAGE_SIZE;
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#else
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@ -605,6 +763,29 @@ void _brick_block_free(void *data, int len, int cline)
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#endif
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order = len2order(len + plus);
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#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
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real_data = data;
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if (order > 1)
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real_data -= PAGE_SIZE;
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inf = _find_block_info(real_data, false);
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if (likely(inf)) {
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prev_line = inf->inf_line;
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if (unlikely(inf->inf_len != (PAGE_SIZE << order))) {
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BRICK_ERR("line %d: address %p: bad freeing size %d (correct should be %d, previous line = %d)\n",
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cline, data, (int)(PAGE_SIZE << order), inf->inf_len, prev_line);
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return;
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}
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if (unlikely(!inf->inf_used)) {
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BRICK_ERR("line %d: address %p: double freeing (previous line = %d)\n", cline, data, prev_line);
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return;
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}
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inf->inf_line = cline;
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inf->inf_used = false;
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} else {
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BRICK_ERR("line %d: trying to free non-existent address %p (order = %d)\n", cline, data, order);
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return;
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}
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#endif
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#ifdef BRICK_DEBUG_MEM
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if (order > 1) {
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void *test = data - PAGE_SIZE;
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@ -615,24 +796,24 @@ void _brick_block_free(void *data, int len, int cline)
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int magic2;
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if (unlikely(magic1 != MAGIC_BLOCK)) {
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BRICK_ERR("line %d memory corruption: magix1 %08x != %08x\n", cline, magic1, MAGIC_BLOCK);
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BRICK_ERR("line %d memory corruption: %p magix1 %08x != %08x (previous line = %d)\n", cline, data, magic1, MAGIC_BLOCK, prev_line);
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return;
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}
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if (unlikely(magic != MAGIC_BLOCK)) {
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BRICK_ERR("line %d memory corruption: magix %08x != %08x\n", cline, magic, MAGIC_BLOCK);
|
||||
BRICK_ERR("line %d memory corruption: %p magix %08x != %08x (previous line = %d)\n", cline, data, magic, MAGIC_BLOCK, prev_line);
|
||||
return;
|
||||
}
|
||||
if (unlikely(line < 0 || line >= BRICK_DEBUG_MEM)) {
|
||||
BRICK_ERR("line %d memory corruption: alloc line = %d\n", cline, line);
|
||||
BRICK_ERR("line %d memory corruption %p: alloc line = %d (previous line = %d)\n", cline, data, line, prev_line);
|
||||
return;
|
||||
}
|
||||
if (unlikely(oldlen != len)) {
|
||||
BRICK_ERR("line %d memory corruption: len != oldlen (%d != %d)\n", cline, len, oldlen);
|
||||
BRICK_ERR("line %d memory corruption %p: len != oldlen (%d != %d, previous line = %d))\n", cline, data, len, oldlen, prev_line);
|
||||
return;
|
||||
}
|
||||
magic2 = INT_ACCESS(data, len);
|
||||
if (unlikely(magic2 != MAGIC_BEND)) {
|
||||
BRICK_ERR("line %d memory corruption: magix %08x != %08x\n", cline, magic, MAGIC_BEND);
|
||||
BRICK_ERR("line %d memory corruption %p: magix %08x != %08x (previous line = %d)\n", cline, data, magic, MAGIC_BEND, prev_line);
|
||||
return;
|
||||
}
|
||||
INT_ACCESS(test, 0) = 0xffffffff;
|
||||
|
@ -647,15 +828,15 @@ void _brick_block_free(void *data, int len, int cline)
|
|||
int oldlen = INT_ACCESS(test, 2 * sizeof(int));
|
||||
|
||||
if (unlikely(magic != MAGIC_BLOCK)) {
|
||||
BRICK_ERR("line %d memory corruption: magix %08x != %08x\n", cline, magic, MAGIC_BLOCK);
|
||||
BRICK_ERR("line %d memory corruption %p: magix %08x != %08x (previous line = %d)\n", cline, data, magic, MAGIC_BLOCK, prev_line);
|
||||
return;
|
||||
}
|
||||
if (unlikely(line < 0 || line >= BRICK_DEBUG_MEM)) {
|
||||
BRICK_ERR("line %d memory corruption: alloc line = %d\n", cline, line);
|
||||
BRICK_ERR("line %d memory corruption %p: alloc line = %d (previous line = %d)\n", cline, data, line, prev_line);
|
||||
return;
|
||||
}
|
||||
if (unlikely(oldlen != len)) {
|
||||
BRICK_ERR("line %d memory corruption: len != oldlen (%d != %d)\n", cline, len, oldlen);
|
||||
BRICK_ERR("line %d memory corruption %p: len != oldlen (%d != %d, previous line = %d))\n", cline, data, len, oldlen, prev_line);
|
||||
return;
|
||||
}
|
||||
atomic_dec(&block_count[line]);
|
||||
|
@ -667,8 +848,8 @@ void _brick_block_free(void *data, int len, int cline)
|
|||
_put_free(data, order);
|
||||
} else
|
||||
#endif
|
||||
__brick_block_free(data, order);
|
||||
|
||||
__brick_block_free(data, order, cline);
|
||||
|
||||
#ifdef CONFIG_MARS_MEM_PREALLOC
|
||||
brick_mem_alloc_count[order] = atomic_dec_return(&_alloc_count[order]);
|
||||
#endif
|
||||
|
@ -799,12 +980,20 @@ EXPORT_SYMBOL_GPL(brick_mem_statistics);
|
|||
|
||||
int __init init_brick_mem(void)
|
||||
{
|
||||
#ifdef CONFIG_MARS_MEM_PREALLOC
|
||||
int i;
|
||||
#ifdef CONFIG_MARS_MEM_PREALLOC
|
||||
for (i = BRICK_MAX_ORDER; i >= 0; i--) {
|
||||
spin_lock_init(&freelist_lock[i]);
|
||||
}
|
||||
#endif
|
||||
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
|
||||
for (i = 0; i < MAX_INFO_LISTS; i++) {
|
||||
INIT_LIST_HEAD(&inf_anchor[i]);
|
||||
rwlock_init(&inf_lock[i]);
|
||||
}
|
||||
#else
|
||||
(void)i;
|
||||
#endif
|
||||
|
||||
get_total_ram();
|
||||
|
||||
|
|
Loading…
Reference in New Issue