diff options
| author | Mike Frysinger <vapier@gentoo.org> | 2009-11-23 21:35:34 -0500 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-11-23 21:35:34 -0500 |
| commit | 00673f93826bf1fbde728d202c319a684bb87150 (patch) | |
| tree | 2918312040781ebf7055ca83321605e7b110002d /libc/sysdeps/linux/alpha/bits/mman.h | |
| parent | c5bc75430dccfaef12220311aa4853176a8a911b (diff) | |
nommu: use MAP_UNINITIALIZE for mallocs
Now that the kernel supports MAP_UNINITIALIZE, have the malloc places use
it to get real uninitialized memory on no-mmu systems. This avoids a lot
of normally useless overhead involved in zeroing out all of the memory
(sometimes multiple times).
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'libc/sysdeps/linux/alpha/bits/mman.h')
| -rw-r--r-- | libc/sysdeps/linux/alpha/bits/mman.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/alpha/bits/mman.h b/libc/sysdeps/linux/alpha/bits/mman.h index 2f0e56491..cafad4a24 100644 --- a/libc/sysdeps/linux/alpha/bits/mman.h +++ b/libc/sysdeps/linux/alpha/bits/mman.h @@ -71,6 +71,8 @@ # define MAP_NORESERVE 0x10000 /* Don't check for reservations. */ # define MAP_POPULATE 0x20000 /* Populate (prefault) pagetables. */ # define MAP_NONBLOCK 0x40000 /* Do not block on IO. */ +# define MAP_UNINITIALIZE 0x4000000 /* For anonymous mmap, memory could + be uninitialized. */ #endif /* Flags to `msync'. */ |