linux-kernel - Re: Attaching a process to cgroups

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 8 Aug 2012 20:40:33 +0400
From:	Alexey Vlasov <renton@...ton.name>
To:	Mike Galbraith <efault@....de>
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com
Subject: Re: Attaching a process to cgroups

On Wed, Jul 25, 2012 at 03:57:47PM +0200, Mike Galbraith wrote:
> > Hanging on read():
> > 
> > # strace -ttT cat /proc/cgroups 
> > 
> > 17:30:43.825005 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 13), ...}) = 0 <0.000005>
> > 17:30:43.825048 open("/proc/cgroups", O_RDONLY) = 3 <0.000014>
> > 17:30:43.825085 fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 <0.000004>
> > 17:30:43.825125 fadvise64(3, 0, 0, POSIX_FADV_SEQUENTIAL) = 0 <0.000005>
> > 17:30:43.825161 read(3, "#subsys_name\thierarchy\tnum_cgrou"..., 32768) = 112 <7.447084>
 
In general I've changed it to synchronize_rcu_expedited () and all the
delays have gone both on writing and reading files from cgroups.

-- 
BRGDS. Alexey Vlasov.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/