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* grub-core/kern/mm.c (grub_real_malloc): Decrease cut-off of moving the

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pointer to 32K. This is the size of cache element which is the most
	common allocation >1K. This way the pointer is always around blocks
	of 32K and so we keep performance while decreasing fragmentation.
This commit is contained in:
Vladimir Serbinenko 2013-11-18 17:41:37 +01:00
parent 39ff43c579
commit 45bf8b3a75
2 changed files with 8 additions and 1 deletions
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ChangeLog
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@ -1,3 +1,10 @@
2013-11-18 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/kern/mm.c (grub_real_malloc): Decrease cut-off of moving the
pointer to 32K. This is the size of cache element which is the most
common allocation >1K. This way the pointer is always around blocks
of 32K and so we keep performance while decreasing fragmentation.
2013-11-18 Vladimir Serbinenko <phcoder@gmail.com> 2013-11-18 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/kern/mm.c (grub_real_malloc): Don't update the pointer to * grub-core/kern/mm.c (grub_real_malloc): Don't update the pointer to

2
grub-core/kern/mm.c
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@ -299,7 +299,7 @@ grub_real_malloc (grub_mm_header_t *first, grub_size_t n, grub_size_t align)
This will have side effect of fragmenting memory as small This will have side effect of fragmenting memory as small
pieces before this will be un-used. */ pieces before this will be un-used. */
/* So do it only for chunks under 64K. */ /* So do it only for chunks under 64K. */
if (n < (0x10000 >> GRUB_MM_ALIGN_LOG2) if (n < (0x8000 >> GRUB_MM_ALIGN_LOG2)
|| *first == p) || *first == p)
*first = q; *first = q;