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malloc: Add THP/madvise support for sbrk

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To increase effectiveness with Transparent Huge Page with madvise, the
large page size is use instead page size for sbrk increment for the
main arena.

Checked on x86_64-linux-gnu.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Adhemerval Zanella 2021-08-13 10:06:04 -03:00
parent 5f6d8d97c6
commit 7478c9959a
2 changed files with 37 additions and 5 deletions
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8
include/libc-pointer-arith.h
View File

@ -60,4 +60,12 @@
#define PTR_ALIGN_UP(base, size) \
((__typeof__ (base)) ALIGN_UP ((uintptr_t) (base), (size)))
/* Check if BASE is aligned on SIZE */
#define PTR_IS_ALIGNED(base, size) \
((((uintptr_t) (base)) & (size - 1)) == 0)
/* Returns the ptrdiff_t diference between P1 and P2. */
#define PTR_DIFF(p1, p2) \
((ptrdiff_t)((uintptr_t)(p1) - (uintptr_t)(p2)))
#endif

34
malloc/malloc.c
View File

@ -2023,6 +2023,16 @@ madvise_thp (void *p, INTERNAL_SIZE_T size)
not active. */
if (mp_.thp_pagesize == 0 || size < mp_.thp_pagesize)
return;
/* Linux requires the input address to be page-aligned, and unaligned
inputs happens only for initial data segment. */
if (__glibc_unlikely (!PTR_IS_ALIGNED (p, GLRO (dl_pagesize))))
{
void *q = PTR_ALIGN_DOWN (p, GLRO (dl_pagesize));
size += PTR_DIFF (p, q);
p = q;
}
__madvise (p, size, MADV_HUGEPAGE);
#endif
}
@ -2609,14 +2619,25 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
size -= old_size;
/*
Round to a multiple of page size.
Round to a multiple of page size or huge page size.
If MORECORE is not contiguous, this ensures that we only call it
with whole-page arguments. And if MORECORE is contiguous and
this is not first time through, this preserves page-alignment of
previous calls. Otherwise, we correct to page-align below.
*/
size = ALIGN_UP (size, pagesize);
#if HAVE_TUNABLES && defined (MADV_HUGEPAGE)
/* Defined in brk.c. */
extern void *__curbrk;
if (__glibc_unlikely (mp_.thp_pagesize != 0))
{
uintptr_t top = ALIGN_UP ((uintptr_t) __curbrk + size,
mp_.thp_pagesize);
size = top - (uintptr_t) __curbrk;
}
else
#endif
size = ALIGN_UP (size, GLRO(dl_pagesize));
/*
Don't try to call MORECORE if argument is so big as to appear
@ -2899,10 +2920,8 @@ systrim (size_t pad, mstate av)
long released; /* Amount actually released */
char *current_brk; /* address returned by pre-check sbrk call */
char *new_brk; /* address returned by post-check sbrk call */
size_t pagesize;
long top_area;
pagesize = GLRO (dl_pagesize);
top_size = chunksize (av->top);
top_area = top_size - MINSIZE - 1;
@ -2910,7 +2929,12 @@ systrim (size_t pad, mstate av)
return 0;
/* Release in pagesize units and round down to the nearest page. */
extra = ALIGN_DOWN(top_area - pad, pagesize);
#if HAVE_TUNABLES && defined (MADV_HUGEPAGE)
if (__glibc_unlikely (mp_.thp_pagesize != 0))
extra = ALIGN_DOWN (top_area - pad, mp_.thp_pagesize);
else
#endif
extra = ALIGN_DOWN (top_area - pad, GLRO(dl_pagesize));
if (extra == 0)
return 0;