Date: Thu, 15 Jan 2015 10:53:43 -0500 From: John Baldwin <jhb@FreeBSD.org> To: Hans Petter Selasky <hselasky@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r277213 - in head: share/man/man9 sys/kern sys/ofed/include/linux sys/sys Message-ID: <54B7E287.80406@FreeBSD.org> In-Reply-To: <201501151532.t0FFWV2Y037455@svn.freebsd.org> References: <201501151532.t0FFWV2Y037455@svn.freebsd.org>
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On 1/15/15 10:32 AM, Hans Petter Selasky wrote: > Author: hselasky > Date: Thu Jan 15 15:32:30 2015 > New Revision: 277213 > URL: https://svnweb.freebsd.org/changeset/base/277213 > > Log: > Major callout subsystem cleanup and rewrite: > - Close a migration race where callout_reset() failed to set the > CALLOUT_ACTIVE flag. > - Callout callback functions are now allowed to be protected by > spinlocks. > - Switching the callout CPU number cannot always be done on a > per-callout basis. See the updated timeout(9) manual page for more > information. > - The timeout(9) manual page has been updated to reflect how all the > functions inside the callout API are working. The manual page has > been made function oriented to make it easier to deduce how each of > the functions making up the callout API are working without having > to first read the whole manual page. Group all functions into a > handful of sections which should give a quick top-level overview > when the different functions should be used. > - The CALLOUT_SHAREDLOCK flag and its functionality has been removed > to reduce the complexity in the callout code and to avoid problems > about atomically stopping callouts via callout_stop(). If someone > needs it, it can be re-added. From my quick grep there are no > CALLOUT_SHAREDLOCK clients in the kernel. > - A new callout API function named "callout_drain_async()" has been > added. See the updated timeout(9) manual page for a complete > description. > - Update the callout clients in the "kern/" folder to use the callout > API properly, like cv_timedwait(). Previously there was some custom > sleepqueue code in the callout subsystem, which has been removed, > because we now allow callouts to be protected by spinlocks. This > allows us to tear down the callout like done with regular mutexes, > and a "td_slpmutex" has been added to "struct thread" to atomically > teardown the "td_slpcallout". Further the "TDF_TIMOFAIL" and > "SWT_SLEEPQTIMO" states can now be completely removed. Currently > they are marked as available and will be cleaned up in a follow up > commit. > - Bump the __FreeBSD_version to indicate kernel modules need > recompilation. > - There has been several reports that this patch "seems to squash a > serious bug leading to a callout timeout and panic". > > Kernel build testing: all architectures were built > MFC after: 2 weeks > Differential Revision: https://reviews.freebsd.org/D1438 > Sponsored by: Mellanox Technologies > Reviewed by: jhb, adrian, sbruno and emaste Eh, I have not reviewed this at all. (I still plan to though.) -- John Baldwin
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