Date: Thu, 9 Oct 2014 05:50:24 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org Subject: svn commit: r272803 - in vendor-sys/illumos/dist/uts/common/fs/zfs: . sys Message-ID: <201410090550.s995oOuP062966@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: delphij Date: Thu Oct 9 05:50:23 2014 New Revision: 272803 URL: https://svnweb.freebsd.org/changeset/base/272803 Log: 5175 implement dmu_read_uio_dbuf() to improve cached read performance Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Alex Reece <alex.reece@delphix.com> Reviewed by: George Wilson <george@delphix.com> Reviewed by: Richard Elling <richard.elling@gmail.com> Approved by: Robert Mustacchi <rm@joyent.com> Author: Matthew Ahrens <mahrens@delphix.com> illumos/illumos-gate@f8554bb92be6be88a684bea58293b41a6168a538 Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dmu.h vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_vnops.c Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c Thu Oct 9 05:48:06 2014 (r272802) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c Thu Oct 9 05:50:23 2014 (r272803) @@ -1015,8 +1015,8 @@ xuio_stat_wbuf_nocopy() } #ifdef _KERNEL -int -dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size) +static int +dmu_read_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size) { dmu_buf_t **dbp; int numbufs, i, err; @@ -1026,8 +1026,8 @@ dmu_read_uio(objset_t *os, uint64_t obje * NB: we could do this block-at-a-time, but it's nice * to be reading in parallel. */ - err = dmu_buf_hold_array(os, object, uio->uio_loffset, size, TRUE, FTAG, - &numbufs, &dbp); + err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size, + TRUE, FTAG, &numbufs, &dbp, 0); if (err) return (err); @@ -1072,6 +1072,58 @@ dmu_read_uio(objset_t *os, uint64_t obje return (err); } +/* + * Read 'size' bytes into the uio buffer. + * From object zdb->db_object. + * Starting at offset uio->uio_loffset. + * + * If the caller already has a dbuf in the target object + * (e.g. its bonus buffer), this routine is faster than dmu_read_uio(), + * because we don't have to find the dnode_t for the object. + */ +int +dmu_read_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size) +{ + dmu_buf_impl_t *db = (dmu_buf_impl_t *)zdb; + dnode_t *dn; + int err; + + if (size == 0) + return (0); + + DB_DNODE_ENTER(db); + dn = DB_DNODE(db); + err = dmu_read_uio_dnode(dn, uio, size); + DB_DNODE_EXIT(db); + + return (err); +} + +/* + * Read 'size' bytes into the uio buffer. + * From the specified object + * Starting at offset uio->uio_loffset. + */ +int +dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size) +{ + dnode_t *dn; + int err; + + if (size == 0) + return (0); + + err = dnode_hold(os, object, FTAG, &dn); + if (err) + return (err); + + err = dmu_read_uio_dnode(dn, uio, size); + + dnode_rele(dn, FTAG); + + return (err); +} + static int dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx) { @@ -1124,6 +1176,15 @@ dmu_write_uio_dnode(dnode_t *dn, uio_t * return (err); } +/* + * Write 'size' bytes from the uio buffer. + * To object zdb->db_object. + * Starting at offset uio->uio_loffset. + * + * If the caller already has a dbuf in the target object + * (e.g. its bonus buffer), this routine is faster than dmu_write_uio(), + * because we don't have to find the dnode_t for the object. + */ int dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size, dmu_tx_t *tx) @@ -1143,6 +1204,11 @@ dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t return (err); } +/* + * Write 'size' bytes from the uio buffer. + * To the specified object. + * Starting at offset uio->uio_loffset. + */ int dmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size, dmu_tx_t *tx) Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dmu.h ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dmu.h Thu Oct 9 05:48:06 2014 (r272802) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dmu.h Thu Oct 9 05:50:23 2014 (r272803) @@ -614,6 +614,7 @@ void dmu_write(objset_t *os, uint64_t ob void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, dmu_tx_t *tx); int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size); +int dmu_read_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size); int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size, dmu_tx_t *tx); int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size, Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_vnops.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_vnops.c Thu Oct 9 05:48:06 2014 (r272802) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_vnops.c Thu Oct 9 05:50:23 2014 (r272803) @@ -406,7 +406,6 @@ static int mappedread(vnode_t *vp, int nbytes, uio_t *uio) { znode_t *zp = VTOZ(vp); - objset_t *os = zp->z_zfsvfs->z_os; int64_t start, off; int len = nbytes; int error = 0; @@ -425,7 +424,8 @@ mappedread(vnode_t *vp, int nbytes, uio_ zfs_unmap_page(pp, va); page_unlock(pp); } else { - error = dmu_read_uio(os, zp->z_id, uio, bytes); + error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl), + uio, bytes); } len -= bytes; off = 0; @@ -460,7 +460,6 @@ zfs_read(vnode_t *vp, uio_t *uio, int io { znode_t *zp = VTOZ(vp); zfsvfs_t *zfsvfs = zp->z_zfsvfs; - objset_t *os; ssize_t n, nbytes; int error = 0; rl_t *rl; @@ -468,7 +467,6 @@ zfs_read(vnode_t *vp, uio_t *uio, int io ZFS_ENTER(zfsvfs); ZFS_VERIFY_ZP(zp); - os = zfsvfs->z_os; if (zp->z_pflags & ZFS_AV_QUARANTINED) { ZFS_EXIT(zfsvfs); @@ -558,10 +556,12 @@ zfs_read(vnode_t *vp, uio_t *uio, int io nbytes = MIN(n, zfs_read_chunk_size - P2PHASE(uio->uio_loffset, zfs_read_chunk_size)); - if (vn_has_cached_data(vp)) + if (vn_has_cached_data(vp)) { error = mappedread(vp, nbytes, uio); - else - error = dmu_read_uio(os, zp->z_id, uio, nbytes); + } else { + error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl), + uio, nbytes); + } if (error) { /* convert checksum errors into IO errors */ if (error == ECKSUM)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201410090550.s995oOuP062966>