Date: Sun, 16 May 2010 11:56:42 +0000 (UTC) From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs vdev_geom.c Message-ID: <201005161156.o4GBupmi008077@repoman.freebsd.org>
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pjd 2010-05-16 11:56:42 UTC
FreeBSD src repository
Modified files:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs vdev_geom.c
Log:
SVN rev 208142 on 2010-05-16 11:56:42Z by pjd
The whole point of having dedicated worker thread for each leaf VDEV was to
avoid calling zio_interrupt() from geom_up thread context. It turns out that
when provider is forcibly removed from the system and we kill worker thread
there can still be some ZIOs pending. To complete pending ZIOs when there is
no worker thread anymore we still have to call zio_interrupt() from geom_up
context. To avoid this race just remove use of worker threads altogether.
This should be more or less fine, because I also thought that zio_interrupt()
does more work, but it only makes small UMA allocation with M_WAITOK.
It also saves one context switch per I/O request.
PR: kern/145339
Reported by: Alex Bakhtin <Alex.Bakhtin@gmail.com>
MFC after: 1 week
Revision Changes Path
1.21 +21 -104 src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
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