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author | Stanislav Kinsbursky <skinsbursky@parallels.com> | 2013-01-04 15:34:50 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-01-04 16:11:45 -0800 |
commit | 03f595668017f1a1fb971c02fc37140bc6e7bb1c (patch) | |
tree | 3aa5c4b32b5fd396f0d74679548de8c09ca195a1 /ipc/compat.c | |
parent | 9afdacda0252fc1ddb7907728e878518edbcdfce (diff) | |
download | linux-03f595668017f1a1fb971c02fc37140bc6e7bb1c.tar.bz2 |
ipc: add sysctl to specify desired next object id
Add 3 new variables and sysctls to tune them (by one "next_id" variable
for messages, semaphores and shared memory respectively). This variable
can be used to set desired id for next allocated IPC object. By default
it's equal to -1 and old behaviour is preserved. If this variable is
non-negative, then desired idr will be extracted from it and used as a
start value to search for free IDR slot.
Notes:
1) this patch doesn't guarantee that the new object will have desired
id. So it's up to user space how to handle new object with wrong id.
2) After a sucessful id allocation attempt, "next_id" will be set back
to -1 (if it was non-negative).
[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/compat.c')
0 files changed, 0 insertions, 0 deletions