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.
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