Hi. Now I've got almost 5k used groups and it got even worse. Now I've got almost 5k used groups and it got even worse.
If only write was working slower, now everything connected with cgroups is hardly working. Could it be connected with synchronize_rcu()? 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> 17:30:51.272302 write(1, "#subsys_name\thierarchy\tnum_cgrou"..., 112#subsys_name hierarchy num_cgroups enabled cpuacct 1 16844 1 memory 2 16844 1 devices 3 16844 1 blkio 4 16844 1 ) = 112 <0.000018> 17:30:51.272363 read(3, "", 32768) = 0 <0.000007> 17:30:51.272405 brk(0x62d000) = 0x62d000 <0.000011> 17:30:51.272444 close(3) = 0 <0.000011> 17:30:51.272488 close(1) = 0 <0.000007> 17:30:51.272518 close(2) = 0 <0.000005> On Wed, Jun 20, 2012 at 02:28:18PM +0200, Mike Galbraith wrote: > On Tue, 2012-06-19 at 22:58 +0400, Alexey Vlasov wrote: > > 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(); > ... > } > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/