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mmap.2: Document MAP_UNINITIALIZED flag 

New in Linux 2.6.33.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2010-03-13 08:08:06 +01:00
parent 7c7adcbe55
commit 12062404f9
1 changed files with 10 additions and 0 deletions
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man2/mmap.2
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@ -287,6 +287,16 @@ support can later be transparently implemented for glibc.
.\" http://thread.gmane.org/gmane.linux.kernel/720412
.\" "pthread_create() slow for many threads; also time to revisit 64b
.\" context switch optimization?"
.TP
.BR MAP_UNINITIALIZED " (since Linux 2.6.33)"
Don't clear anonymous pages.
This flag is intended to improve performance on embedded devices.
This flag is only honored if the kernel was configured with the
.B CONFIG_MMAP_ALLOW_UNINITIALIZED
option.
Because of the security implications,
that option is normally enabled only on embedded devices
(i.e., devices where one has complete control of the contents of user memory).
.LP
Of the above flags, only
.B MAP_FIXED