linux-kernel - Re: Attaching a process to cgroups

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Date:	Wed, 20 Jun 2012 14:28:18 +0200
From:	Mike Galbraith <efault@....de>
To:	Alexey Vlasov <renton@...ton.name>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Attaching a process to cgroups

On Tue, 2012-06-19 at 22:58 +0400, Alexey Vlasov wrote: 
> Hi.
> 
> Is it possible to somehow fasten a process of pid attaching to cgroup?
> The problem is the pid attaches to a task-file with some strange delay:
> 
> 22:28:00.788224 open("/sys/fs/cgroup/memory/virtwww/w_test-l24-apache1_4bdf3d13/apache/tasks", O_WRONLY|O_CREAT|O_APPEND, 0666) = 3 <0.000035>
> 22:28:00.788289 fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 <0.000004>
> 22:28:00.788326 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f5e78074000 <0.000005>
> 22:28:00.788355 fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 <0.000004>
> 22:28:00.788389 lseek(3, 0, SEEK_SET)   = 0 <0.000004>
> 22:28:00.788426 write(3, "16317\n", 6)  = 6 <0.128094>
> 22:28:00.916578 close(3)                = 0 <0.000006>


kernel/cgroup.c::cgroup_attach_task()
{
...
	synchronize_rcu();
...
}

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