Date: Tue, 21 Mar 2017 19:42:27 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: stable@freebsd.org Subject: Lock contention in AIO Message-ID: <20170321164227.GE86500@zxy.spb.ru>
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I am see lock contetntion cuased by aio read (same file segment from
multiple process simultaneous):
07.74% [26756] lock_delay @ /boot/kernel/kernel
92.21% [24671] __mtx_lock_sleep
52.14% [12864] vm_page_enqueue
100.0% [12864] vm_fault_hold
87.71% [11283] vm_fault_quick_hold_pages
100.0% [11283] vn_io_fault1
100.0% [11283] vn_io_fault
99.88% [11270] aio_process_rw
100.0% [11270] aio_daemon
100.0% [11270] fork_exit
00.12% [13] dofileread
100.0% [13] kern_readv
Is this know problem?
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