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MEDIUM: pool: refactor malloc_trim/glibc and jemalloc api addition detections.

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Attempt to detect jemalloc at runtime before hand whether linked or via
symbols overrides, and fall back to malloc_trim/glibc for Linux otherwise.
This commit is contained in:
David Carlier 2021-11-25 16:09:45 +00:00 committed by Willy Tarreau
parent 5bae85d0d2
commit ed232148a7
1 changed files with 32 additions and 30 deletions
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52
src/pool.c
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@ -42,24 +42,39 @@ int mem_poison_byte = -1;
static int mem_fail_rate = 0;
#endif
#if defined(HA_HAVE_MALLOC_TRIM)
static int using_libc_allocator = 0;
static int using_default_allocator = 1;
static int(*my_mallctl)(const char *, void *, size_t *, void *, size_t) = NULL;
/* ask the allocator to trim memory pools */
static void trim_all_pools(void)
{
if (using_libc_allocator)
#if defined(HA_HAVE_MALLOC_TRIM)
if (using_default_allocator)
malloc_trim(0);
#endif
}
/* check if we're using the same allocator as the one that provides
* malloc_trim() and mallinfo(). The principle is that on glibc, both
* malloc_trim() and mallinfo() are provided, and using mallinfo() we
* can check if malloc() is performed through glibc or any other one
* the executable was linked against (e.g. jemalloc).
* the executable was linked against (e.g. jemalloc). Prior to this we
* have to check whether we're running on jemalloc by verifying if the
* mallctl() function is provided. Its pointer will be used later.
*/
static void detect_allocator(void)
{
extern int mallctl(const char *, void *, size_t *, void *, size_t) __attribute__((weak));
my_mallctl = mallctl;
if (!my_mallctl) {
my_mallctl = get_sym_curr_addr("mallctl");
using_default_allocator = (my_mallctl == NULL);
}
if (!my_mallctl) {
#if defined(HA_HAVE_MALLOC_TRIM)
#ifdef HA_HAVE_MALLINFO2
struct mallinfo2 mi1, mi2;
#else
@ -80,28 +95,15 @@ static void detect_allocator(void)
#endif
free(DISGUISE(ptr));
using_libc_allocator = !!memcmp(&mi1, &mi2, sizeof(mi1));
}
static int is_trim_enabled(void)
{
return using_libc_allocator;
}
#else
static void trim_all_pools(void)
{
}
static void detect_allocator(void)
{
}
static int is_trim_enabled(void)
{
return 0;
}
using_default_allocator = !!memcmp(&mi1, &mi2, sizeof(mi1));
#endif
}
}
static int is_trim_enabled(void)
{
return using_default_allocator;
}
/* Try to find an existing shared pool with the same characteristics and
* returns it, otherwise creates this one. NULL is returned if no memory