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pipe.7: Document /proc files controlling memory usage by pipes 

Document /proc/sys/fs/pipe-max-size and
/proc/sys/fs/pipe-user-pages-{soft,hard}.

Signed-off: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Vegard Nossum 2016-08-13 08:30:07 +12:00 committed by Michael Kerrisk
parent 8fc9ce245d
commit 81c4577e23
1 changed files with 32 additions and 0 deletions
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@ -159,6 +159,38 @@ The
operation is not specified in any standard,
but is provided on many implementations.
.\"
.SS /proc files
On Linux, the following files control how much memory can be used for pipes:
.TP
.IR /proc/sys/fs/pipe-max-pages " (since Linux 2.6.34)"
.\" commit b492e95be0ae672922f4734acf3f5d35c30be948
Deprecated since Linux 2.6.35.
.TP
.IR /proc/sys/fs/pipe-max-size " (since Linux 2.6.35)"
.\" commit ff9da691c0498ff81fdd014e7a0731dab2337dac
The maximum size (in bytes) of individual pipes created or set by users
without the
.B CAP_SYS_RESOURCE
capability.
.TP
.IR /proc/sys/fs/pipe-user-pages-hard " (since Linux 4.4)"
.\" commit 759c01142a5d0f364a462346168a56de28a80f52
The combined maximum size (in pages) of all pipes created or set by a
single user without both the
.B CAP_SYS_RESOURCE
and
.B CAP_SYS_ADMIN
capabilities.
.TP
.IR /proc/sys/fs/pipe-user-pages-soft " (since Linux 4.4)"
.\" commit 759c01142a5d0f364a462346168a56de28a80f52
The combined size (in pages) of all pipes created or set by a single
user (without both the
.B CAP_SYS_RESOURCE
and
.B CAP_SYS_ADMIN
capabilities) after which individual pipes will be limited to 1 page.
.\"
.SS PIPE_BUF
POSIX.1 says that
.BR write (2)s