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SubjectRe: Attaching a process to cgroups
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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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