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Tweak realloc/MREMAP comment to be more accurate.

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MMap'd memory isn't shrunk without MREMAP, but IIRC this is intentional for
performance reasons.  Regardless, this patch tweaks the existing comment to
be more accurate wrt the existing code.

	[BZ #21411]
	* malloc/malloc.c: Tweak realloc/MREMAP comment to be more accurate.
This commit is contained in:
DJ Delorie 2017-05-03 16:25:15 -04:00
parent e35ac97cc8
commit 3b5f801ddb
2 changed files with 8 additions and 3 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2017-05-03 DJ Delorie <dj@redhat.com>
[BZ #21411]
* malloc/malloc.c: Tweak realloc/MREMAP comment to be more accurate.
2017-05-03 Phil Blundell <pb@pbcl.net>
* inet/netinet/in.h (struct ip_mreq_source): Correct misplaced

6
malloc/malloc.c
View File

@ -514,9 +514,9 @@ void* __libc_calloc(size_t, size_t);
REALLOC_ZERO_BYTES_FREES is set, realloc with a size argument of
zero (re)allocates a minimum-sized chunk.
Large chunks that were internally obtained via mmap will always
be reallocated using malloc-copy-free sequences unless
the system supports MREMAP (currently only linux).
Large chunks that were internally obtained via mmap will always be
grown using malloc-copy-free sequences unless the system supports
MREMAP (currently only linux).
The old unix realloc convention of allowing the last-free'd chunk
to be used as an argument to realloc is not supported.