mirror of https://github.com/mkerrisk/man-pages
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:
parent
7c7adcbe55
commit
12062404f9
10
man2/mmap.2
10
man2/mmap.2
|
@ -287,6 +287,16 @@ support can later be transparently implemented for glibc.
|
||||||
.\" http://thread.gmane.org/gmane.linux.kernel/720412
|
.\" http://thread.gmane.org/gmane.linux.kernel/720412
|
||||||
.\" "pthread_create() slow for many threads; also time to revisit 64b
|
.\" "pthread_create() slow for many threads; also time to revisit 64b
|
||||||
.\" context switch optimization?"
|
.\" 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
|
.LP
|
||||||
Of the above flags, only
|
Of the above flags, only
|
||||||
.B MAP_FIXED
|
.B MAP_FIXED
|
||||||
|
|
Loading…
Reference in New Issue