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epoll.7: remove documentation of /proc/sys/fs/epoll/max_user_instances 

This /proc interface appeared in 2.6.28. but will be
removed in 2.6.29.

Also, document change in default value of
/proc/sys/fs/epoll/max_user_watches (was 1/32 of lowmem,
now 1/25 of lowmem).

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2009-02-01 08:23:38 +13:00
parent 95d240f7d4
commit 597fa43c2c
1 changed files with 8 additions and 7 deletions
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15
man7/epoll.7
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@ -18,7 +18,7 @@
.\"
.\" Davide Libenzi <davidel@xmailserver.org>
.\"
.TH EPOLL 7 2009-01-17 "Linux" "Linux Programmer's Manual"
.TH EPOLL 7 2009-02-01 "Linux" "Linux Programmer's Manual"
.SH NAME
epoll \- I/O event notification facility
.SH SYNOPSIS
@ -172,10 +172,11 @@ with
.SS /proc interfaces
The following interfaces can be used to limit the amount of
kernel memory consumed by epoll:
.TP
.IR /proc/sys/fs/epoll/max_user_instances " (since Linux 2.6.28)"
This specifies an upper limit on the number of epoll instances
that can be created per real user ID.
.\" Following was added in 2.6.28, but them removed in 2.6.29
.\" .TP
.\" .IR /proc/sys/fs/epoll/max_user_instances " (since Linux 2.6.28)"
.\" This specifies an upper limit on the number of epoll instances
.\" that can be created per real user ID.
.TP
.IR /proc/sys/fs/epoll/max_user_watches " (since Linux 2.6.28)"
This specifies a limit on the total number of
@ -185,10 +186,10 @@ The limit is per real user ID.
Each registered file descriptor costs roughly 90 bytes on a 32-bit kernel,
and roughly 160 bytes on a 64-bit kernel.
Currently,
.\" 2.6.28
.\" 2.6.29 (in 2.6.28, the default was 1/32 of lowmem)
the default value for
.I max_user_watches
is 1/32 of the available low memory,
is 1/25 (4%) of the available low memory,
divided by the registration cost in bytes.
.SS Example for Suggested Usage
While the usage of