Date: Fri, 10 Jan 2020 00:53:21 +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-12@freebsd.org Subject: svn commit: r356588 - stable/12/sys/geom Message-ID: <202001100053.00A0rLsb023440@repo.freebsd.org>
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Author: mav Date: Fri Jan 10 00:53:20 2020 New Revision: 356588 URL: https://svnweb.freebsd.org/changeset/base/356588 Log: MFC r356214: Avoid few memory accesses in g_disk_done(). Modified: stable/12/sys/geom/geom_disk.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/geom/geom_disk.c ============================================================================== --- stable/12/sys/geom/geom_disk.c Fri Jan 10 00:48:00 2020 (r356587) +++ stable/12/sys/geom/geom_disk.c Fri Jan 10 00:53:20 2020 (r356588) @@ -66,6 +66,7 @@ __FBSDID("$FreeBSD$"); struct g_disk_softc { struct mtx done_mtx; struct disk *dp; + struct devstat *d_devstat; struct sysctl_ctx_list sysctl_ctx; struct sysctl_oid *sysctl_tree; char led[64]; @@ -232,15 +233,13 @@ g_disk_done(struct bio *bp) struct g_disk_softc *sc; /* See "notes" for why we need a mutex here */ - /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ + sc = bp->bio_caller1; bp2 = bp->bio_parent; - sc = bp2->bio_to->private; - bp->bio_completed = bp->bio_length - bp->bio_resid; binuptime(&now); mtx_lock(&sc->done_mtx); if (bp2->bio_error == 0) bp2->bio_error = bp->bio_error; - bp2->bio_completed += bp->bio_completed; + bp2->bio_completed += bp->bio_length - bp->bio_resid; switch (bp->bio_cmd) { case BIO_ZONE: @@ -250,7 +249,7 @@ g_disk_done(struct bio *bp) case BIO_WRITE: case BIO_DELETE: case BIO_FLUSH: - devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); + devstat_end_transaction_bio_bt(sc->d_devstat, bp, &now); break; default: break; @@ -470,6 +469,7 @@ g_disk_start(struct bio *bp) bp->bio_error = ENOMEM; } bp2->bio_done = g_disk_done; + bp2->bio_caller1 = sc; bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; bp2->bio_bcount = bp2->bio_length; bp2->bio_disk = dp; @@ -555,6 +555,7 @@ g_disk_start(struct bio *bp) return; } bp2->bio_done = g_disk_done; + bp2->bio_caller1 = sc; bp2->bio_disk = dp; mtx_lock(&sc->start_mtx); devstat_start_transaction_bio(dp->d_devstat, bp2); @@ -709,6 +710,7 @@ g_disk_create(void *arg, int flag) mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); sc->dp = dp; + sc->d_devstat = dp->d_devstat; gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); gp->softc = sc; LIST_FOREACH(dap, &dp->d_aliases, da_next) {
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