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improve memory fragmentation by dynamic raise of limits

This commit is contained in:
Thomas Schoebel-Theuer 2011-11-16 09:48:07 +01:00 committed by Thomas Schoebel-Theuer
parent 77ac60b93a
commit b97aa05479
1 changed files with 11 additions and 0 deletions
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11
brick_mem.c
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@ -14,6 +14,7 @@
//#define LIMIT_MEM //#define LIMIT_MEM
#define USE_KERNEL_PAGES // currently mandatory (vmalloc does not work) #define USE_KERNEL_PAGES // currently mandatory (vmalloc does not work)
//#define BUMP_LIMITS // try to avoid this //#define BUMP_LIMITS // try to avoid this
#define ALLOW_DYNAMIC_RAISE 512
#ifndef CONFIG_DEBUG_KERNEL #ifndef CONFIG_DEBUG_KERNEL
#undef BRICK_DEBUG_MEM #undef BRICK_DEBUG_MEM
@ -386,8 +387,18 @@ void *_brick_block_alloc(loff_t pos, int len, int line)
atomic_inc(&op_count[order]); atomic_inc(&op_count[order]);
atomic_inc(&alloc_count[order]); atomic_inc(&alloc_count[order]);
count = atomic_read(&alloc_count[order]); count = atomic_read(&alloc_count[order]);
// statistics
if (count > alloc_max[order]) if (count > alloc_max[order])
alloc_max[order] = count; alloc_max[order] = count;
/* Dynamic increase of limits, in order to reduce
* fragmentation on higher-order pages.
* This comes on cost of higher memory usage.
*/
#if defined(ALLOW_DYNAMIC_RAISE) && defined(CONFIG_MARS_MEM_PREALLOC)
if (order > 0 && count > freelist_max[order] && count <= ALLOW_DYNAMIC_RAISE)
freelist_max[order] = count;
#endif
#endif #endif
#ifdef CONFIG_MARS_MEM_PREALLOC #ifdef CONFIG_MARS_MEM_PREALLOC