Date: Tue, 7 Jan 2020 00:54:45 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r356430 - stable/11/sys/dev/ioat Message-ID: <202001070054.0070sjZN005279@repo.freebsd.org>
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Author: mav Date: Tue Jan 7 00:54:45 2020 New Revision: 356430 URL: https://svnweb.freebsd.org/changeset/base/356430 Log: MFC r356216: Don't spin on cleanup_lock if we are not interrupt. If somebody else holds that lock, it will likely do the work for us. If it won't, then we return here later and retry. Under heavy load it allows to avoid lock congestion between interrupt and polling threads. Modified: stable/11/sys/dev/ioat/ioat.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/dev/ioat/ioat.c ============================================================================== --- stable/11/sys/dev/ioat/ioat.c Tue Jan 7 00:54:23 2020 (r356429) +++ stable/11/sys/dev/ioat/ioat.c Tue Jan 7 00:54:45 2020 (r356430) @@ -682,7 +682,12 @@ ioat_process_events(struct ioat_softc *ioat, boolean_t uint32_t completed, chanerr; int error; - mtx_lock(&ioat->cleanup_lock); + if (intr) { + mtx_lock(&ioat->cleanup_lock); + } else { + if (!mtx_trylock(&ioat->cleanup_lock)) + return; + } /* * Don't run while the hardware is being reset. Reset is responsible
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