Messages in this thread | | | From | Dmitry Monakhov <> | Subject | Re: [git head f4b87dee9] BUG: using smp_processor_id() in preemptible (VFS-related) | Date | Mon, 24 May 2010 18:18:07 +0400 |
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Jan Kara <jack@suse.cz> writes:
> Hi, > >> On Sat, 22 May 2010 23:36:59 +0200 "Rafael J. Wysocki" <rjw@sisk.pl> wrote: >> > [ 6.906133] EXT4-fs (sda7): mounted filesystem with ordered data mode >> > [ 7.014359] BUG: using smp_processor_id() in preemptible [00000000] code: mount/1501 >> > [ 7.020570] caller is dqstats_inc+0x19/0x2c >> > [ 7.026658] Pid: 1501, comm: mount Not tainted 2.6.34-tst #25 >> > [ 7.032792] Call Trace: >> > [ 7.038859] [<ffffffff8117c12b>] debug_smp_processor_id+0xcb/0xdc >> > [ 7.045025] [<ffffffff8111dfb5>] dqstats_inc+0x19/0x2c >> > [ 7.051201] [<ffffffff81120fac>] vfs_quota_sync+0x144/0x210 >> > [ 7.057349] [<ffffffff810eccfa>] ? __shrink_dcache_sb+0x284/0x293 >> > [ 7.063574] [<ffffffff810fc48d>] __sync_filesystem+0x3a/0x7e >> > [ 7.069730] [<ffffffff810fc552>] sync_filesystem+0x36/0x4c >> > [ 7.075867] [<ffffffff810deef0>] do_remount_sb+0x65/0x13c >> > [ 7.081960] [<ffffffff810f4359>] do_mount+0x251/0x78a >> > [ 7.088039] [<ffffffff810f2c3e>] ? copy_mount_options+0xda/0x146 >> > [ 7.094086] [<ffffffff810f4911>] sys_mount+0x7f/0xb8 >> > [ 7.100085] [<ffffffff81002aeb>] system_call_fastpath+0x16/0x1b >> > [ 7.124208] BUG: using smp_processor_id() in preemptible [00000000] code: mount/1501 >> > [ 7.130307] caller is dqstats_inc+0x19/0x2c >> > [ 7.136386] Pid: 1501, comm: mount Not tainted 2.6.34-tst #25 >> > [ 7.142512] Call Trace: >> > [ 7.148629] [<ffffffff8117c12b>] debug_smp_processor_id+0xcb/0xdc >> > [ 7.154846] [<ffffffff8111dfb5>] dqstats_inc+0x19/0x2c >> > [ 7.161019] [<ffffffff81120fac>] vfs_quota_sync+0x144/0x210 >> > [ 7.167171] [<ffffffff810fc48d>] __sync_filesystem+0x3a/0x7e >> > [ 7.173364] [<ffffffff810fc563>] sync_filesystem+0x47/0x4c >> > [ 7.179522] [<ffffffff810deef0>] do_remount_sb+0x65/0x13c >> > [ 7.185616] [<ffffffff810f4359>] do_mount+0x251/0x78a >> > [ 7.191663] [<ffffffff810f2c3e>] ? copy_mount_options+0xda/0x146 >> > [ 7.197626] [<ffffffff810f4911>] sys_mount+0x7f/0xb8 >> > [ 7.203493] [<ffffffff81002aeb>] system_call_fastpath+0x16/0x1b >> > [ 11.643596] udev: starting version 153 >> > >> > This is after reverting commit a7cf4145b (anon_inode: set S_IFREG on the >> > anon_inode) that the system is not really useable with. >> >> Caused by "quota: Make quota stat accounting lockless". >> >> Guys, the code this patch adds utterly duplicates the interface >> provided by include/linux/percpu_counter.h, only the quota code does it >> wrongly and badly. Please, can we use the nice library code? > I was thinking about this when merging the code and I thought that I'll save > some memory (~200 bytes) because stats are fine with 32-bit counters (instead of > 64-bit ones) and I'm interested only in rough counts, not exact ones. Since the > code Dmitry added was quite simple, I thought the duplication won't be so bad. > But the code is probably more subtle than I thought so those 200 bytes aren't > worth it. So let's convert it to generic per-cpu counters. Dmitry, will you do it? Yes. I will. BTW we are working on generic scalable resource counter which is based on percpu counters and lockless on fast-paths. Resource counter examples: quota limits, bean-counters, etc. The core idea in most situations resource has three main points: zero, soft-barrier, hard-barrier where exact accuracy is required. > Hmm, I'm also wondering why I didn't see the warning Rafael was hitting in my > test runs... Ah, my kernel config has CONFIG_PREEMPT_NONE! I guess using > CONFIG_PREEMPT is likely to give a better test coverage, right? Unfortunately preempt_debug was disabled on my testing hosts too. > > Honza
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