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bionic: pass MADV_MERGEABLE on private & anonymous mmaps

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Change-Id: I8bc167bb33dec6417fe772172697ea6ff97da2f6
Signed-off-by: Iliyan Malchev <malchev@google.com>
This commit is contained in:
JP Abgrall
2012-03-21 13:19:51 -07:00
parent 2f33c5a8e4
commit b8e1e9685e
1 changed files with 13 additions and 6 deletions
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19
libc/unistd/mmap.c
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@@ -32,12 +32,19 @@
extern void* __mmap2(void*, size_t, int, int, int, size_t); extern void* __mmap2(void*, size_t, int, int, int, size_t);
#define MMAP2_SHIFT 12 #define MMAP2_SHIFT 12
void* mmap( void* addr, size_t size, int prot, int flags, int fd, long offset ) void* mmap(void *addr, size_t size, int prot, int flags, int fd, long offset)
{ {
if ( offset & ((1UL << MMAP2_SHIFT)-1) ) { void *ret;
errno = EINVAL;
return MAP_FAILED;
}
return __mmap2(addr, size, prot, flags, fd, (size_t)offset >> MMAP2_SHIFT); if (offset & ((1UL << MMAP2_SHIFT)-1)) {
errno = EINVAL;
return MAP_FAILED;
}
ret = __mmap2(addr, size, prot, flags, fd, (size_t)offset >> MMAP2_SHIFT);
if (ret && (flags & (MAP_PRIVATE | MAP_ANONYMOUS)))
madvise(ret, size, MADV_MERGEABLE);
return ret;
} }