Re: [Jfs-discussion] benchmark results
On Sun, Jan 10, 2010 at 08:03:04PM -0500, Casey Allen Shobe wrote: > On Dec 25, 2009, at 11:22 AM, Larry McVoy wrote: >> Dudes, sync() doesn't flush the fs cache, you have to unmount for >> that. >> Once upon a time Linux had an ioctl() to flush the fs buffers, I used >> it in lmbench. > > > You do not need to unmount - 2.6.16+ have a mechanism in /proc to flush > caches. See http://linux-mm.org/Drop_Caches Cool, but I tend to come at problems from a cross platform point of view. Aix no hable /proc :) -- --- Larry McVoylm at bitmover.com http://www.bitkeeper.com -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Jfs-discussion] benchmark results
On Dec 25, 2009, at 11:22 AM, Larry McVoy wrote: Dudes, sync() doesn't flush the fs cache, you have to unmount for that. Once upon a time Linux had an ioctl() to flush the fs buffers, I used it in lmbench. You do not need to unmount - 2.6.16+ have a mechanism in /proc to flush caches. See http://linux-mm.org/Drop_Caches Cheers, -- Casey Allen Shobe ca...@shobe.info -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: task imap:2958 blocked for more than 120 seconds
On Sun, Jan 10, 2010 at 09:05:46PM +0100, Johannes Hirte wrote: > I've observed this hanging task now several times. Not sure when this > started, > but 2.6.32 is affected too, IIRC. I don't have a test pattern for this. > Dovecot > imap triggers this from time to time. I've enabled CONFIG_DETECT_HUNG_TASK > now > and got this two tasks which hang: You're stuck on a read, could you please do a sysrq-w when this happens? Also, do you eventually recover or are you stuck forever? -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: snapshot/subvolume removal
On Fri, Jan 08, 2010 at 05:28:42PM +0900, TARUISI Hiroaki wrote: > For now, subvolumes and snapshots look like just directories. > If you want to distinguish them, there's only an unusual way, > that is, analyzing with btrfs-debug-tree. > > I posted patches for listing snapshots/subvolumes two months ago, > and Josef Bacik posted its bugfix patch. This feature may be > delivered in sooner or later. > If you want to try it now, check these URLs. > http://patchwork.kernel.org/patch/60923/raw/ > http://patchwork.kernel.org/patch/60920/raw/ > http://patchwork.kernel.org/patch/67332/raw/ > Patches and requests are welcome. Thanks again for the subvolume listing patch, it's going to be a great feature. I'm afraid I've had to make some small changes. ioctls have some very strict rules for the arguments, and pointers and list heads should not be passed in ioctl structs. We also need to change the patch to make the ioct args struct the same size on both 32 bit and 64 bit machines, which usually just means aligning and padding the fields as required. I have started on this and hope to finish it on Tuesday. But if you have any additions to the patch please let me know. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
task imap:2958 blocked for more than 120 seconds
I've observed this hanging task now several times. Not sure when this started,
but 2.6.32 is affected too, IIRC. I don't have a test pattern for this. Dovecot
imap triggers this from time to time. I've enabled CONFIG_DETECT_HUNG_TASK now
and got this two tasks which hang:
INFO: task imap:2958 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
imap D 0 2958 2653 0x
88008caf5a28 0046 810544cf
88008caf5998 0001 88008caf5fd8 88008caf9530
de78 001d2700 001d2700 88008caf9530
Call Trace:
[] ? trace_hardirqs_off+0xd/0xf
[] ? trace_hardirqs_on_caller+0x10c/0x130
[] ? sync_page+0x0/0x48
[] io_schedule+0x38/0x4d
[] sync_page+0x44/0x48
[] __wait_on_bit_lock+0x41/0x8a
[] __lock_page+0x61/0x68
[] ? wake_bit_function+0x0/0x2e
[] filemap_fault+0xea/0x345
[] __do_fault+0x50/0x3d3
[] handle_mm_fault+0x32f/0x65d
[] ? do_page_fault+0xf4/0x26f
[] ? __down_read_trylock+0x46/0x4e
[] ? down_read_trylock+0x3f/0x49
[] ? do_page_fault+0xf4/0x26f
[] do_page_fault+0x257/0x26f
[] page_fault+0x1f/0x30
[] ? might_fault+0x57/0xa7
[] ? btrfs_copy_from_user+0x4f/0x113
[] ? btrfs_copy_from_user+0xde/0x113
[] btrfs_file_write+0x439/0x6fe
[] vfs_write+0xad/0x14e
[] ? trace_hardirqs_on_caller+0x10c/0x130
[] sys_pwrite64+0x55/0x74
[] system_call_fastpath+0x16/0x1b
2 locks held by imap/2958:
#0: (&sb->s_type->i_mutex_key#4){+.+.+.}, at: []
btrfs_file_write+0x169/0x6fe
#1: (&mm->mmap_sem){++}, at: []
do_page_fault+0xf4/0x26f
INFO: task flush-btrfs-2:2783 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
