From owner-svn-src-head@FreeBSD.ORG Wed Jan 6 22:39:41 2010 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 020E6106568F; Wed, 6 Jan 2010 22:39:41 +0000 (UTC) (envelope-from pjd@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id E5DAB8FC19; Wed, 6 Jan 2010 22:39:40 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id o06MdeqK061079; Wed, 6 Jan 2010 22:39:40 GMT (envelope-from pjd@svn.freebsd.org) Received: (from pjd@localhost) by svn.freebsd.org (8.14.3/8.14.3/Submit) id o06MdeSA061078; Wed, 6 Jan 2010 22:39:40 GMT (envelope-from pjd@svn.freebsd.org) Message-Id: <201001062239.o06MdeSA061078@svn.freebsd.org> From: Pawel Jakub Dawidek Date: Wed, 6 Jan 2010 22:39:40 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r201684 - head/sys/cddl/boot/zfs X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Jan 2010 22:39:41 -0000 Author: pjd Date: Wed Jan 6 22:39:40 2010 New Revision: 201684 URL: http://svn.freebsd.org/changeset/base/201684 Log: Teach the (gpt)zfsboot and zfsloader raidz code to use its buffers more efficiently. Before this patch, in the worst case memory use would increase exponentially on the number of drives in the raidz vdev. Submitted by: Matt Reimer Sponsored by: VPOP Technologies, Inc. Silence from: dfr Modified: head/sys/cddl/boot/zfs/zfssubr.c Modified: head/sys/cddl/boot/zfs/zfssubr.c ============================================================================== --- head/sys/cddl/boot/zfs/zfssubr.c Wed Jan 6 22:19:57 2010 (r201683) +++ head/sys/cddl/boot/zfs/zfssubr.c Wed Jan 6 22:39:40 2010 (r201684) @@ -454,7 +454,7 @@ vdev_raidz_reconstruct_q(raidz_col_t *co static void vdev_raidz_reconstruct_pq(raidz_col_t *cols, int nparity, int acols, - int x, int y) + int x, int y, void *temp_p, void *temp_q) { uint8_t *p, *q, *pxy, *qxy, *xd, *yd, tmp, a, b, aexp, bexp; void *pdata, *qdata; @@ -478,10 +478,8 @@ vdev_raidz_reconstruct_pq(raidz_col_t *c xsize = cols[x].rc_size; ysize = cols[y].rc_size; - cols[VDEV_RAIDZ_P].rc_data = - zfs_alloc_temp(cols[VDEV_RAIDZ_P].rc_size); - cols[VDEV_RAIDZ_Q].rc_data = - zfs_alloc_temp(cols[VDEV_RAIDZ_Q].rc_size); + cols[VDEV_RAIDZ_P].rc_data = temp_p; + cols[VDEV_RAIDZ_Q].rc_data = temp_q; cols[x].rc_size = 0; cols[y].rc_size = 0; @@ -551,9 +549,12 @@ vdev_raidz_read(vdev_t *vdev, const blkp uint64_t f = b % dcols; uint64_t o = (b / dcols) << unit_shift; uint64_t q, r, coff; - int c, c1, bc, col, acols, devidx, asize, n; + int c, c1, bc, col, acols, devidx, asize, n, max_rc_size; static raidz_col_t cols[16]; raidz_col_t *rc, *rc1; + void *orig, *orig1, *temp_p, *temp_q; + + orig = orig1 = temp_p = temp_q = NULL; q = s / (dcols - nparity); r = s - q * (dcols - nparity); @@ -561,6 +562,7 @@ vdev_raidz_read(vdev_t *vdev, const blkp acols = (q == 0 ? bc : dcols); asize = 0; + max_rc_size = 0; for (c = 0; c < acols; c++) { col = f + c; @@ -577,6 +579,8 @@ vdev_raidz_read(vdev_t *vdev, const blkp cols[c].rc_tried = 0; cols[c].rc_skipped = 0; asize += cols[c].rc_size; + if (cols[c].rc_size > max_rc_size) + max_rc_size = cols[c].rc_size; } asize = roundup(asize, (nparity + 1) << unit_shift); @@ -777,8 +781,13 @@ reconstruct: //ASSERT(c != acols); //ASSERT(!rc->rc_skipped || rc->rc_error == ENXIO || rc->rc_error == ESTALE); + if (temp_p == NULL) + temp_p = zfs_alloc_temp(max_rc_size); + if (temp_q == NULL) + temp_q = zfs_alloc_temp(max_rc_size); + vdev_raidz_reconstruct_pq(cols, nparity, acols, - c1, c); + c1, c, temp_p, temp_q); if (zio_checksum_error(bp, buf) == 0) return (0); @@ -845,18 +854,12 @@ reconstruct: return (EIO); } - asize = 0; - for (c = 0; c < acols; c++) { - rc = &cols[c]; - if (rc->rc_size > asize) - asize = rc->rc_size; - } if (cols[VDEV_RAIDZ_P].rc_error == 0) { /* * Attempt to reconstruct the data from parity P. */ - void *orig; - orig = zfs_alloc_temp(asize); + if (orig == NULL) + orig = zfs_alloc_temp(max_rc_size); for (c = nparity; c < acols; c++) { rc = &cols[c]; @@ -874,8 +877,8 @@ reconstruct: /* * Attempt to reconstruct the data from parity Q. */ - void *orig; - orig = zfs_alloc_temp(asize); + if (orig == NULL) + orig = zfs_alloc_temp(max_rc_size); for (c = nparity; c < acols; c++) { rc = &cols[c]; @@ -895,9 +898,14 @@ reconstruct: /* * Attempt to reconstruct the data from both P and Q. */ - void *orig, *orig1; - orig = zfs_alloc_temp(asize); - orig1 = zfs_alloc_temp(asize); + if (orig == NULL) + orig = zfs_alloc_temp(max_rc_size); + if (orig1 == NULL) + orig1 = zfs_alloc_temp(max_rc_size); + if (temp_p == NULL) + temp_p = zfs_alloc_temp(max_rc_size); + if (temp_q == NULL) + temp_q = zfs_alloc_temp(max_rc_size); for (c = nparity; c < acols - 1; c++) { rc = &cols[c]; @@ -909,7 +917,7 @@ reconstruct: memcpy(orig1, rc1->rc_data, rc1->rc_size); vdev_raidz_reconstruct_pq(cols, nparity, - acols, c, c1); + acols, c, c1, temp_p, temp_q); if (zio_checksum_error(bp, buf) == 0) return (0);