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Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations

From Ilya Dryomov <idryomov@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations
Date 2017-03-29 13:20 +0200
Message-ID <tqjNT-63S-3@gated-at.bofh.it> (permalink)
References (3 earlier) <tpZmb-8cB-65@gated-at.bofh.it> <tpZvR-8gn-67@gated-at.bofh.it> <tqi5t-4RU-31@gated-at.bofh.it> <tqjkS-5EX-21@gated-at.bofh.it> <tqjEe-60u-13@gated-at.bofh.it>
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On Wed, Mar 29, 2017 at 1:05 PM, Brian Foster <bfoster@redhat.com> wrote:
> On Wed, Mar 29, 2017 at 12:41:26PM +0200, Michal Hocko wrote:
>> [CC xfs guys]
>>
>> On Wed 29-03-17 11:21:44, Ilya Dryomov wrote:
>> [...]
>> > This is a set of stack traces from http://tracker.ceph.com/issues/19309
>> > (linked in the changelog):
>> >
>> > Workqueue: ceph-msgr con_work [libceph]
>> > ffff8810871cb018 0000000000000046 0000000000000000 ffff881085d40000
>> > 0000000000012b00 ffff881025cad428 ffff8810871cbfd8 0000000000012b00
>> > ffff880102fc1000 ffff881085d40000 ffff8810871cb038 ffff8810871cb148
>> > Call Trace:
>> > [<ffffffff816dd629>] schedule+0x29/0x70
>> > [<ffffffff816e066d>] schedule_timeout+0x1bd/0x200
>> > [<ffffffff81093ffc>] ? ttwu_do_wakeup+0x2c/0x120
>> > [<ffffffff81094266>] ? ttwu_do_activate.constprop.135+0x66/0x70
>> > [<ffffffff816deb5f>] wait_for_completion+0xbf/0x180
>> > [<ffffffff81097cd0>] ? try_to_wake_up+0x390/0x390
>> > [<ffffffff81086335>] flush_work+0x165/0x250
>>
>> I suspect this is xlog_cil_push_now -> flush_work(&cil->xc_push_work)
>> right? I kind of got lost where this waits on an IO.
>>
>
> Yep. That means a CIL push is already in progress. We wait on that to
> complete here. After that, the resulting task queues execution of
> xlog_cil_push_work()->xlog_cil_push() on m_cil_workqueue. That task may
> submit I/O to the log.
>
> I don't see any reference to xlog_cil_push() anywhere in the traces here
> or in the bug referenced above, however..?

Well, it's prefaced with "Interesting is:"...  Sergey (the original
reporter, CCed here) might still have the rest of them.

Thanks,

                Ilya

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[PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 14:40 +0200
  Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-28 15:10 +0200
    Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-28 15:30 +0200
      Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-28 15:40 +0200
        Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-29 11:30 +0200
          Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-29 12:50 +0200
            Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-29 13:00 +0200
              Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-29 13:20 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-29 13:20 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-29 16:30 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-30 08:30 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-30 12:10 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-30 13:30 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-30 15:50 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-30 16:40 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-30 17:10 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-30 18:20 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-30 19:30 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-30 20:50 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-30 16:00 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-30 16:10 +0200
            Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Brian Foster <bfoster@redhat.com> - 2017-03-29 13:10 +0200
              Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-29 13:20 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-29 13:30 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Brian Foster <bfoster@redhat.com> - 2017-03-29 14:00 +0200
                Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations Ilya Dryomov <idryomov@gmail.com> - 2017-03-29 16:40 +0200

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