svn commit: r329612 - in head/sys: kern sys
Conrad Meyer
cem at freebsd.org
Wed Feb 21 17:03:06 UTC 2018
Do you have r329672 yet?
Best,
Conrad
On Wed, Feb 21, 2018 at 7:11 AM, Andrew Turner <andrew at fubar.geek.nz> wrote:
>
>> On 20 Feb 2018, at 00:06, Jeff Roberson <jeff at FreeBSD.org> wrote:
>>
>> Author: jeff
>> Date: Tue Feb 20 00:06:07 2018
>> New Revision: 329612
>> URL: https://svnweb.freebsd.org/changeset/base/329612
>>
>> Log:
>> Further parallelize the buffer cache.
>>
>> Provide multiple clean queues partitioned into 'domains'. Each domain manages
>> its own bufspace and has its own bufspace daemon. Each domain has a set of
>> subqueues indexed by the current cpuid to reduce lock contention on the cleanq.
>>
>> Refine the sleep/wakeup around the bufspace daemon to use atomics as much as
>> possible.
>>
>> Add a B_REUSE flag that is used to requeue bufs during the scan to approximate
>> LRU rather than locking the queue on every use of a frequently accessed buf.
>>
>> Implement bufspace_reserve with only atomic_fetchadd to avoid loop restarts.
>>
>> Reviewed by: markj
>> Tested by: pho
>> Sponsored by: Netflix, Dell/EMC Isilon
>> Differential Revision: https://reviews.freebsd.org/D14274
>
> I’m seeing the following panic on FreeBSD/arm64 after this change.
>
> Andrew
>
> panic: bq_remove: Remove buffer 0xffff00004082f260 from wrong queue.
> cpuid = 4
> time = 1519088201
> KDB: stack backtrace:
> db_trace_self() at db_trace_self_wrapper+0x28
> pc = 0xffff00000062fee4 lr = 0xffff0000000c0450
> sp = 0xffff000040364480 fp = 0xffff000040364690
>
> db_trace_self_wrapper() at vpanic+0x184
> pc = 0xffff0000000c0450 lr = 0xffff000000354ce8
> sp = 0xffff0000403646a0 fp = 0xffff000040364720
>
> vpanic() at kassert_panic+0x158
> pc = 0xffff000000354ce8 lr = 0xffff000000354b60
> sp = 0xffff000040364730 fp = 0xffff0000403647f0
>
> kassert_panic() at bq_remove+0x178
> pc = 0xffff000000354b60 lr = 0xffff0000003f7014
> sp = 0xffff000040364800 fp = 0xffff000040364810
>
> bq_remove() at buf_recycle+0x100
> pc = 0xffff0000003f7014 lr = 0xffff0000003fca80
> sp = 0xffff000040364820 fp = 0xffff000040364880
>
> buf_recycle() at bufspace_daemon+0xb4
> pc = 0xffff0000003fca80 lr = 0xffff0000003fd31c
> sp = 0xffff000040364890 fp = 0xffff000040364910
>
> bufspace_daemon() at fork_exit+0x7c
> pc = 0xffff0000003fd31c lr = 0xffff000000318388
> sp = 0xffff000040364920 fp = 0xffff000040364950
>
> fork_exit() at fork_trampoline+0x10
> pc = 0xffff000000318388 lr = 0xffff000000649ec4
> sp = 0xffff000040364960 fp = 0x0000000000000000
>
> KDB: enter: panic
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