lkml.org 
[lkml]   [2008]   [May]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[RFC/PATCH 4/8]: CGroup Files: Move notify_on_release file to separate write handler
This patch moves the write handler for the cgroups notify_on_release
file into a separate handler. This handler requires no cgroups locking
since it relies on atomic bitops for synchronization.

Signed-off-by: Paul Menage <menage@google.com>

---
kernel/cgroup.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)

Index: cgroup-2.6.25-mm1/kernel/cgroup.c
===================================================================
--- cgroup-2.6.25-mm1.orig/kernel/cgroup.c
+++ cgroup-2.6.25-mm1/kernel/cgroup.c
@@ -1440,13 +1440,6 @@ static ssize_t cgroup_common_file_write(
case FILE_TASKLIST:
retval = attach_task_by_pid(cgrp, buffer);
break;
- case FILE_NOTIFY_ON_RELEASE:
- clear_bit(CGRP_RELEASABLE, &cgrp->flags);
- if (simple_strtoul(buffer, NULL, 10) != 0)
- set_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
- else
- clear_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
- break;
default:
retval = -EINVAL;
goto out2;
@@ -2275,6 +2268,18 @@ static u64 cgroup_read_notify_on_release
return notify_on_release(cgrp);
}

+static int cgroup_write_notify_on_release(struct cgroup *cgrp,
+ struct cftype *cft,
+ u64 val)
+{
+ clear_bit(CGRP_RELEASABLE, &cgrp->flags);
+ if (val)
+ set_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
+ else
+ clear_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
+ return 0;
+}
+
/*
* for the common functions, 'private' gives the type of file
*/
@@ -2291,7 +2296,7 @@ static struct cftype files[] = {
{
.name = "notify_on_release",
.read_u64 = cgroup_read_notify_on_release,
- .write = cgroup_common_file_write,
+ .write_u64 = cgroup_write_notify_on_release,
.private = FILE_NOTIFY_ON_RELEASE,
},
};
--


\
 
 \ /
  Last update: 2008-05-13 09:21    [W:0.152 / U:0.724 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site