From 3409166615df47b946607357d2f99a456a6e713d Mon Sep 17 00:00:00 2001 From: Alexander Motin Date: Thu, 3 Nov 2016 15:52:28 +0200 Subject: [PATCH] OpenZFS 7578 - Fix/improve some aspects of ZIL writing. - After some ZIL changes 6 years ago zil_slog_limit got partially broken due to zl_itx_list_sz not updated when async itx'es upgraded to sync. Actually because of other changes about that time zl_itx_list_sz is not really required to implement the functionality, so this patch removes some unneeded broken code and variables. - Original idea of zil_slog_limit was to reduce chance of SLOG abuse by single heavy logger, that increased latency for other (more latency critical) loggers, by pushing heavy log out into the main pool instead of SLOG. Beside huge latency increase for heavy writers, this implementation caused double write of all data, since the log records were explicitly prepared for SLOG. Since we now have I/O scheduler, I've found it can be much more efficient to reduce priority of heavy logger SLOG writes from ZIO_PRIORITY_SYNC_WRITE to ZIO_PRIORITY_ASYNC_WRITE, while still leave them on SLOG. - Existing ZIL implementation had problem with space efficiency when it has to write large chunks of data into log blocks of limited size. In some cases efficiency stopped to almost as low as 50%. In case of ZIL stored on spinning rust, that also reduced log write speed in half, since head had to uselessly fly over allocated but not written areas. This change improves the situation by offloading problematic operations from z*_log_write() to zil_lwb_commit(), which knows real situation of log blocks allocation and can split large requests into pieces much more efficiently. Also as side effect it removes one of two data copy operations done by ZIL code WR_COPIED case. - While there, untangle and unify code of z*_log_write() functions. Also zfs_log_write() alike to zvol_log_write() can now handle writes crossing block boundary, that may also improve efficiency if ZPL is made to do that. Sponsored by: iXsystems, Inc. Authored by: Alexander Motin Reviewed by: Matthew Ahrens Reviewed by: Prakash Surya Reviewed by: Andriy Gapon Reviewed by: Steven Hartland Reviewed by: Brad Lewis Reviewed by: Richard Elling Approved by: Robert Mustacchi Ported-by: Giuseppe Di Natale OpenZFS-issue: https://www.illumos.org/issues/7578 OpenZFS-commit: https://github.com/openzfs/openzfs/commit/aeb13ac --- cmd/ztest/ztest.c | 1 - include/sys/trace_zil.h | 8 +-- include/sys/zil.h | 1 - include/sys/zil_impl.h | 20 +++++- include/sys/zio.h | 2 +- man/man5/zfs-module-parameters.5 | 8 ++- module/zfs/zfs_log.c | 37 ++++------ module/zfs/zil.c | 118 +++++++++++++++++-------------- module/zfs/zio.c | 17 +++-- module/zfs/zvol.c | 49 ++++++------- 10 files changed, 133 insertions(+), 128 deletions(-) diff --git a/cmd/ztest/ztest.c b/cmd/ztest/ztest.c index ea1a3030bc42..39fbfd993adf 100644 --- a/cmd/ztest/ztest.c +++ b/cmd/ztest/ztest.c @@ -1620,7 +1620,6 @@ ztest_log_write(ztest_ds_t *zd, dmu_tx_t *tx, lr_write_t *lr) itx->itx_private = zd; itx->itx_wr_state = write_state; itx->itx_sync = (ztest_random(8) == 0); - itx->itx_sod += (write_state == WR_NEED_COPY ? lr->lr_length : 0); bcopy(&lr->lr_common + 1, &itx->itx_lr + 1, sizeof (*lr) - sizeof (lr_t)); diff --git a/include/sys/trace_zil.h b/include/sys/trace_zil.h index 5b43480aea21..eaa391270d76 100644 --- a/include/sys/trace_zil.h +++ b/include/sys/trace_zil.h @@ -63,7 +63,6 @@ DECLARE_EVENT_CLASS(zfs_zil_class, __field(uint64_t, zl_parse_lr_count) __field(uint64_t, zl_next_batch) __field(uint64_t, zl_com_batch) - __field(uint64_t, zl_itx_list_sz) __field(uint64_t, zl_cur_used) __field(clock_t, zl_replay_time) __field(uint64_t, zl_replay_blks) @@ -88,7 +87,6 @@ DECLARE_EVENT_CLASS(zfs_zil_class, __entry->zl_parse_lr_count = zilog->zl_parse_lr_count; __entry->zl_next_batch = zilog->zl_next_batch; __entry->zl_com_batch = zilog->zl_com_batch; - __entry->zl_itx_list_sz = zilog->zl_itx_list_sz; __entry->zl_cur_used = zilog->zl_cur_used; __entry->zl_replay_time = zilog->zl_replay_time; __entry->zl_replay_blks = zilog->zl_replay_blks; @@ -98,8 +96,7 @@ DECLARE_EVENT_CLASS(zfs_zil_class, "replay %u stop_sync %u writer %u logbias %u sync %u " "parse_error %u parse_blk_seq %llu parse_lr_seq %llu " "parse_blk_count %llu parse_lr_count %llu next_batch %llu " - "com_batch %llu itx_list_sz %llu cur_used %llu replay_time %lu " - "replay_blks %llu }", + "com_batch %llu cur_used %llu replay_time %lu replay_blks %llu }", __entry->zl_lr_seq, __entry->zl_commit_lr_seq, __entry->zl_destroy_txg, __entry->zl_replaying_seq, __entry->zl_suspend, __entry->zl_suspending, __entry->zl_keep_first, @@ -107,8 +104,7 @@ DECLARE_EVENT_CLASS(zfs_zil_class, __entry->zl_logbias, __entry->zl_sync, __entry->zl_parse_error, __entry->zl_parse_blk_seq, __entry->zl_parse_lr_seq, __entry->zl_parse_blk_count, __entry->zl_parse_lr_count, - __entry->zl_next_batch, __entry->zl_com_batch, - __entry->zl_itx_list_sz, __entry->zl_cur_used, + __entry->zl_next_batch, __entry->zl_com_batch, __entry->zl_cur_used, __entry->zl_replay_time, __entry->zl_replay_blks) ); /* END CSTYLED */ diff --git a/include/sys/zil.h b/include/sys/zil.h index 62572f894a17..95fd324b4abf 100644 --- a/include/sys/zil.h +++ b/include/sys/zil.h @@ -394,7 +394,6 @@ typedef struct itx { uint8_t itx_sync; /* synchronous transaction */ zil_callback_t itx_callback; /* Called when the itx is persistent */ void *itx_callback_data; /* User data for the callback */ - uint64_t itx_sod; /* record size on disk */ uint64_t itx_oid; /* object id */ lr_t itx_lr; /* common part of log record */ /* followed by type-specific part of lr_xx_t and its immediate data */ diff --git a/include/sys/zil_impl.h b/include/sys/zil_impl.h index 0c426a15dd06..13ecca3c8b04 100644 --- a/include/sys/zil_impl.h +++ b/include/sys/zil_impl.h @@ -42,6 +42,7 @@ typedef struct lwb { zilog_t *lwb_zilog; /* back pointer to log struct */ blkptr_t lwb_blk; /* on disk address of this log blk */ boolean_t lwb_fastwrite; /* is blk marked for fastwrite? */ + boolean_t lwb_slog; /* lwb_blk is on SLOG device */ int lwb_nused; /* # used bytes in buffer */ int lwb_sz; /* size of block and buffer */ char *lwb_buf; /* log write buffer */ @@ -62,7 +63,6 @@ typedef struct itxs { typedef struct itxg { kmutex_t itxg_lock; /* lock for this structure */ uint64_t itxg_txg; /* txg for this chain */ - uint64_t itxg_sod; /* total size on disk for this txg */ itxs_t *itxg_itxs; /* sync and async itxs */ } itxg_t; @@ -120,7 +120,6 @@ struct zilog { kcondvar_t zl_cv_batch[2]; /* batch condition variables */ itxg_t zl_itxg[TXG_SIZE]; /* intent log txg chains */ list_t zl_itx_commit_list; /* itx list to be committed */ - uint64_t zl_itx_list_sz; /* total size of records on list */ uint64_t zl_cur_used; /* current commit log size used */ list_t zl_lwb_list; /* in-flight log write list */ kmutex_t zl_vdev_lock; /* protects zl_vdev_tree */ @@ -140,9 +139,26 @@ typedef struct zil_bp_node { avl_node_t zn_node; } zil_bp_node_t; +/* + * Maximum amount of write data that can be put into single log block. + */ #define ZIL_MAX_LOG_DATA (SPA_OLD_MAXBLOCKSIZE - sizeof (zil_chain_t) - \ sizeof (lr_write_t)) +/* + * Maximum amount of log space we agree to waste to reduce number of + * WR_NEED_COPY chunks to reduce zl_get_data() overhead (~12%). + */ +#define ZIL_MAX_WASTE_SPACE (ZIL_MAX_LOG_DATA / 8) + +/* + * Maximum amount of write data for WR_COPIED. Fall back to WR_NEED_COPY + * as more space efficient if we can't fit at least two log records into + * maximum sized log block. + */ +#define ZIL_MAX_COPIED_DATA ((SPA_OLD_MAXBLOCKSIZE - \ + sizeof (zil_chain_t)) / 2 - sizeof (lr_write_t)) + #ifdef __cplusplus } #endif diff --git a/include/sys/zio.h b/include/sys/zio.h index 23c918af18ce..4eaabc38c86f 100644 --- a/include/sys/zio.h +++ b/include/sys/zio.h @@ -515,7 +515,7 @@ extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, enum zio_flag flags); extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, - uint64_t size, boolean_t use_slog); + uint64_t size, boolean_t *slog); extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); extern void zio_flush(zio_t *zio, vdev_t *vd); extern void zio_shrink(zio_t *zio, uint64_t size); diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index 51f1cd93f1cf..d4bab8327c42 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -1935,12 +1935,14 @@ Use \fB1\fR for yes and \fB0\fR for no (default). .sp .ne 2 .na -\fBzil_slog_limit\fR (ulong) +\fBzil_slog_bulk\fR (ulong) .ad .RS 12n -Max commit bytes to separate log device +Limit SLOG write size per commit executed with synchronous priority. +Any writes above that will be executed with lower (asynchronous) priority +to limit potential SLOG device abuse by single active ZIL writer. .sp -Default value: \fB1,048,576\fR. +Default value: \fB786,432\fR. .RE .sp diff --git a/module/zfs/zfs_log.c b/module/zfs/zfs_log.c index ca369905246a..8887f037aa34 100644 --- a/module/zfs/zfs_log.c +++ b/module/zfs/zfs_log.c @@ -487,10 +487,9 @@ zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype, znode_t *zp, offset_t off, ssize_t resid, int ioflag, zil_callback_t callback, void *callback_data) { + uint32_t blocksize = zp->z_blksz; itx_wr_state_t write_state; - boolean_t slogging; uintptr_t fsync_cnt; - ssize_t immediate_write_sz; if (zil_replaying(zilog, tx) || zp->z_unlinked || zfs_xattr_owner_unlinked(zp)) { @@ -499,12 +498,10 @@ zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype, return; } - immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) - ? 0 : (ssize_t)zfs_immediate_write_sz; - - slogging = spa_has_slogs(zilog->zl_spa) && - (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); - if (resid > immediate_write_sz && !slogging && resid <= zp->z_blksz) + if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) + write_state = WR_INDIRECT; + else if (!spa_has_slogs(zilog->zl_spa) && + resid >= zfs_immediate_write_sz) write_state = WR_INDIRECT; else if (ioflag & (FSYNC | FDSYNC)) write_state = WR_COPIED; @@ -518,30 +515,26 @@ zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype, while (resid) { itx_t *itx; lr_write_t *lr; - ssize_t len; + itx_wr_state_t wr_state = write_state; + ssize_t len = resid; - /* - * If the write would overflow the largest block then split it. - */ - if (write_state != WR_INDIRECT && resid > ZIL_MAX_LOG_DATA) - len = SPA_OLD_MAXBLOCKSIZE >> 1; - else - len = resid; + if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA) + wr_state = WR_NEED_COPY; + else if (wr_state == WR_INDIRECT) + len = MIN(blocksize - P2PHASE(off, blocksize), resid); itx = zil_itx_create(txtype, sizeof (*lr) + - (write_state == WR_COPIED ? len : 0)); + (wr_state == WR_COPIED ? len : 0)); lr = (lr_write_t *)&itx->itx_lr; - if (write_state == WR_COPIED && dmu_read(ZTOZSB(zp)->z_os, + if (wr_state == WR_COPIED && dmu_read(ZTOZSB(zp)->z_os, zp->z_id, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { zil_itx_destroy(itx); itx = zil_itx_create(txtype, sizeof (*lr)); lr = (lr_write_t *)&itx->itx_lr; - write_state = WR_NEED_COPY; + wr_state = WR_NEED_COPY; } - itx->itx_wr_state = write_state; - if (write_state == WR_NEED_COPY) - itx->itx_sod += len; + itx->itx_wr_state = wr_state; lr->lr_foid = zp->z_id; lr->lr_offset = off; lr->lr_length = len; diff --git a/module/zfs/zil.c b/module/zfs/zil.c index 12a034d5ba89..6a1f190f5e6c 100644 --- a/module/zfs/zil.c +++ b/module/zfs/zil.c @@ -102,6 +102,13 @@ int zil_replay_disable = 0; */ int zfs_nocacheflush = 0; +/* + * Limit SLOG write size per commit executed with synchronous priority. + * Any writes above that will be executed with lower (asynchronous) priority + * to limit potential SLOG device abuse by single active ZIL writer. + */ +unsigned long zil_slog_bulk = 768 * 1024; + static kmem_cache_t *zil_lwb_cache; static void zil_async_to_sync(zilog_t *zilog, uint64_t foid); @@ -449,7 +456,8 @@ zil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg) } static lwb_t * -zil_alloc_lwb(zilog_t *zilog, blkptr_t *bp, uint64_t txg, boolean_t fastwrite) +zil_alloc_lwb(zilog_t *zilog, blkptr_t *bp, boolean_t slog, uint64_t txg, + boolean_t fastwrite) { lwb_t *lwb; @@ -457,6 +465,7 @@ zil_alloc_lwb(zilog_t *zilog, blkptr_t *bp, uint64_t txg, boolean_t fastwrite) lwb->lwb_zilog = zilog; lwb->lwb_blk = *bp; lwb->lwb_fastwrite = fastwrite; + lwb->lwb_slog = slog; lwb->lwb_buf = zio_buf_alloc(BP_GET_LSIZE(bp)); lwb->lwb_max_txg = txg; lwb->lwb_zio = NULL; @@ -542,6 +551,7 @@ zil_create(zilog_t *zilog) blkptr_t blk; int error = 0; boolean_t fastwrite = FALSE; + boolean_t slog = FALSE; /* * Wait for any previous destroy to complete. @@ -570,7 +580,7 @@ zil_create(zilog_t *zilog) } error = zio_alloc_zil(zilog->zl_spa, txg, &blk, - ZIL_MIN_BLKSZ, B_TRUE); + ZIL_MIN_BLKSZ, &slog); fastwrite = TRUE; if (error == 0) @@ -581,7 +591,7 @@ zil_create(zilog_t *zilog) * Allocate a log write buffer (lwb) for the first log block. */ if (error == 0) - lwb = zil_alloc_lwb(zilog, &blk, txg, fastwrite); + lwb = zil_alloc_lwb(zilog, &blk, slog, txg, fastwrite); /* * If we just allocated the first log block, commit our transaction @@ -915,6 +925,7 @@ static void zil_lwb_write_init(zilog_t *zilog, lwb_t *lwb) { zbookmark_phys_t zb; + zio_priority_t prio; SET_BOOKMARK(&zb, lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET], ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, @@ -934,9 +945,13 @@ zil_lwb_write_init(zilog_t *zilog, lwb_t *lwb) metaslab_fastwrite_mark(zilog->zl_spa, &lwb->lwb_blk); lwb->lwb_fastwrite = 1; } + if (!lwb->lwb_slog || zilog->zl_cur_used <= zil_slog_bulk) + prio = ZIO_PRIORITY_SYNC_WRITE; + else + prio = ZIO_PRIORITY_ASYNC_WRITE; lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa, 0, &lwb->lwb_blk, lwb_abd, BP_GET_LSIZE(&lwb->lwb_blk), - zil_lwb_write_done, lwb, ZIO_PRIORITY_SYNC_WRITE, + zil_lwb_write_done, lwb, prio, ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_FASTWRITE, &zb); } @@ -957,15 +972,6 @@ uint64_t zil_block_buckets[] = { UINT64_MAX }; -/* - * Use the slog as long as the current commit size is less than the - * limit or the total list size is less than 2X the limit. Limit - * checking is disabled by setting zil_slog_limit to UINT64_MAX. - */ -unsigned long zil_slog_limit = 1024 * 1024; -#define USE_SLOG(zilog) (((zilog)->zl_cur_used < zil_slog_limit) || \ - ((zilog)->zl_itx_list_sz < (zil_slog_limit << 1))) - /* * Start a log block write and advance to the next log block. * Calls are serialized. @@ -981,7 +987,7 @@ zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb) uint64_t txg; uint64_t zil_blksz, wsz; int i, error; - boolean_t use_slog; + boolean_t slog; if (BP_GET_CHECKSUM(&lwb->lwb_blk) == ZIO_CHECKSUM_ZILOG2) { zilc = (zil_chain_t *)lwb->lwb_buf; @@ -1037,10 +1043,8 @@ zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb) zilog->zl_prev_rotor = (zilog->zl_prev_rotor + 1) & (ZIL_PREV_BLKS - 1); BP_ZERO(bp); - use_slog = USE_SLOG(zilog); - error = zio_alloc_zil(spa, txg, bp, zil_blksz, - USE_SLOG(zilog)); - if (use_slog) { + error = zio_alloc_zil(spa, txg, bp, zil_blksz, &slog); + if (slog) { ZIL_STAT_BUMP(zil_itx_metaslab_slog_count); ZIL_STAT_INCR(zil_itx_metaslab_slog_bytes, lwb->lwb_nused); } else { @@ -1055,7 +1059,7 @@ zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb) /* * Allocate a new log write buffer (lwb). */ - nlwb = zil_alloc_lwb(zilog, bp, txg, TRUE); + nlwb = zil_alloc_lwb(zilog, bp, slog, txg, TRUE); /* Record the block for later vdev flushing */ zil_add_block(zilog, &lwb->lwb_blk); @@ -1092,45 +1096,53 @@ zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb) static lwb_t * zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb) { - lr_t *lrc = &itx->itx_lr; /* common log record */ - lr_write_t *lrw = (lr_write_t *)lrc; + lr_t *lrcb, *lrc; + lr_write_t *lrwb, *lrw; char *lr_buf; - uint64_t txg = lrc->lrc_txg; - uint64_t reclen = lrc->lrc_reclen; - uint64_t dlen = 0; + uint64_t dlen, dnow, lwb_sp, reclen, txg; if (lwb == NULL) return (NULL); ASSERT(lwb->lwb_buf != NULL); - if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY) + lrc = &itx->itx_lr; /* Common log record inside itx. */ + lrw = (lr_write_t *)lrc; /* Write log record inside itx. */ + if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY) { dlen = P2ROUNDUP_TYPED( lrw->lr_length, sizeof (uint64_t), uint64_t); - + } else { + dlen = 0; + } + reclen = lrc->lrc_reclen; zilog->zl_cur_used += (reclen + dlen); + txg = lrc->lrc_txg; zil_lwb_write_init(zilog, lwb); +cont: /* * If this record won't fit in the current log block, start a new one. + * For WR_NEED_COPY optimize layout for minimal number of chunks. */ - if (lwb->lwb_nused + reclen + dlen > lwb->lwb_sz) { + lwb_sp = lwb->lwb_sz - lwb->lwb_nused; + if (reclen > lwb_sp || (reclen + dlen > lwb_sp && + lwb_sp < ZIL_MAX_WASTE_SPACE && (dlen % ZIL_MAX_LOG_DATA == 0 || + lwb_sp < reclen + dlen % ZIL_MAX_LOG_DATA))) { lwb = zil_lwb_write_start(zilog, lwb); if (lwb == NULL) return (NULL); zil_lwb_write_init(zilog, lwb); ASSERT(LWB_EMPTY(lwb)); - if (lwb->lwb_nused + reclen + dlen > lwb->lwb_sz) { - txg_wait_synced(zilog->zl_dmu_pool, txg); - return (lwb); - } + lwb_sp = lwb->lwb_sz - lwb->lwb_nused; + ASSERT3U(reclen + MIN(dlen, sizeof (uint64_t)), <=, lwb_sp); } + dnow = MIN(dlen, lwb_sp - reclen); lr_buf = lwb->lwb_buf + lwb->lwb_nused; bcopy(lrc, lr_buf, reclen); - lrc = (lr_t *)lr_buf; - lrw = (lr_write_t *)lrc; + lrcb = (lr_t *)lr_buf; /* Like lrc, but inside lwb. */ + lrwb = (lr_write_t *)lrcb; /* Like lrw, but inside lwb. */ ZIL_STAT_BUMP(zil_itx_count); @@ -1147,10 +1159,13 @@ zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb) char *dbuf; int error; - if (dlen) { - ASSERT(itx->itx_wr_state == WR_NEED_COPY); + if (itx->itx_wr_state == WR_NEED_COPY) { dbuf = lr_buf + reclen; - lrw->lr_common.lrc_reclen += dlen; + lrcb->lrc_reclen += dnow; + if (lrwb->lr_length > dnow) + lrwb->lr_length = dnow; + lrw->lr_offset += dnow; + lrw->lr_length -= dnow; ZIL_STAT_BUMP(zil_itx_needcopy_count); ZIL_STAT_INCR(zil_itx_needcopy_bytes, lrw->lr_length); @@ -1162,7 +1177,7 @@ zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb) lrw->lr_length); } error = zilog->zl_get_data( - itx->itx_private, lrw, dbuf, lwb->lwb_zio); + itx->itx_private, lrwb, dbuf, lwb->lwb_zio); if (error == EIO) { txg_wait_synced(zilog->zl_dmu_pool, txg); return (lwb); @@ -1181,12 +1196,18 @@ zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb) * equal to the itx sequence number because not all transactions * are synchronous, and sometimes spa_sync() gets there first. */ - lrc->lrc_seq = ++zilog->zl_lr_seq; /* we are single threaded */ - lwb->lwb_nused += reclen + dlen; + lrcb->lrc_seq = ++zilog->zl_lr_seq; /* we are single threaded */ + lwb->lwb_nused += reclen + dnow; lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg); ASSERT3U(lwb->lwb_nused, <=, lwb->lwb_sz); ASSERT0(P2PHASE(lwb->lwb_nused, sizeof (uint64_t))); + dlen -= dnow; + if (dlen > 0) { + zilog->zl_cur_used += reclen; + goto cont; + } + return (lwb); } @@ -1200,7 +1221,6 @@ zil_itx_create(uint64_t txtype, size_t lrsize) itx = zio_data_buf_alloc(offsetof(itx_t, itx_lr) + lrsize); itx->itx_lr.lrc_txtype = txtype; itx->itx_lr.lrc_reclen = lrsize; - itx->itx_sod = lrsize; /* if write & WR_NEED_COPY will be increased */ itx->itx_lr.lrc_seq = 0; /* defensive */ itx->itx_sync = B_TRUE; /* default is synchronous */ itx->itx_callback = NULL; @@ -1351,11 +1371,8 @@ zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx) */ zfs_dbgmsg("zil_itx_assign: missed itx cleanup for " "txg %llu", itxg->itxg_txg); - atomic_add_64(&zilog->zl_itx_list_sz, -itxg->itxg_sod); - itxg->itxg_sod = 0; clean = itxg->itxg_itxs; } - ASSERT(itxg->itxg_sod == 0); itxg->itxg_txg = txg; itxs = itxg->itxg_itxs = kmem_zalloc(sizeof (itxs_t), KM_SLEEP); @@ -1368,8 +1385,6 @@ zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx) } if (itx->itx_sync) { list_insert_tail(&itxs->i_sync_list, itx); - atomic_add_64(&zilog->zl_itx_list_sz, itx->itx_sod); - itxg->itxg_sod += itx->itx_sod; } else { avl_tree_t *t = &itxs->i_async_tree; uint64_t foid = @@ -1419,8 +1434,6 @@ zil_clean(zilog_t *zilog, uint64_t synced_txg) ASSERT3U(itxg->itxg_txg, <=, synced_txg); ASSERT(itxg->itxg_txg != 0); ASSERT(zilog->zl_clean_taskq != NULL); - atomic_add_64(&zilog->zl_itx_list_sz, -itxg->itxg_sod); - itxg->itxg_sod = 0; clean_me = itxg->itxg_itxs; itxg->itxg_itxs = NULL; itxg->itxg_txg = 0; @@ -1444,7 +1457,6 @@ zil_get_commit_list(zilog_t *zilog) { uint64_t otxg, txg; list_t *commit_list = &zilog->zl_itx_commit_list; - uint64_t push_sod = 0; if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */ otxg = ZILTEST_TXG; @@ -1476,12 +1488,9 @@ zil_get_commit_list(zilog_t *zilog) ASSERT(zilog_is_dirty_in_txg(zilog, txg) || spa_freeze_txg(zilog->zl_spa) != UINT64_MAX); list_move_tail(commit_list, &itxg->itxg_itxs->i_sync_list); - push_sod += itxg->itxg_sod; - itxg->itxg_sod = 0; mutex_exit(&itxg->itxg_lock); } - atomic_add_64(&zilog->zl_itx_list_sz, -push_sod); } /* @@ -2304,13 +2313,14 @@ EXPORT_SYMBOL(zil_bp_tree_add); EXPORT_SYMBOL(zil_set_sync); EXPORT_SYMBOL(zil_set_logbias); +/* BEGIN CSTYLED */ module_param(zil_replay_disable, int, 0644); MODULE_PARM_DESC(zil_replay_disable, "Disable intent logging replay"); module_param(zfs_nocacheflush, int, 0644); MODULE_PARM_DESC(zfs_nocacheflush, "Disable cache flushes"); -/* CSTYLED */ -module_param(zil_slog_limit, ulong, 0644); -MODULE_PARM_DESC(zil_slog_limit, "Max commit bytes to separate log device"); +module_param(zil_slog_bulk, ulong, 0644); +MODULE_PARM_DESC(zil_slog_bulk, "Limit in bytes slog sync writes per commit"); +/* END CSTYLED */ #endif diff --git a/module/zfs/zio.c b/module/zfs/zio.c index 61eb575ef817..acfc49eb5f47 100644 --- a/module/zfs/zio.c +++ b/module/zfs/zio.c @@ -3098,7 +3098,7 @@ zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) */ int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, uint64_t size, - boolean_t use_slog) + boolean_t *slog) { int error = 1; zio_alloc_list_t io_alloc_list; @@ -3106,17 +3106,16 @@ zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, uint64_t size, ASSERT(txg > spa_syncing_txg(spa)); metaslab_trace_init(&io_alloc_list); - - if (use_slog) { - error = metaslab_alloc(spa, spa_log_class(spa), size, - new_bp, 1, txg, NULL, METASLAB_FASTWRITE, - &io_alloc_list, NULL); - } - - if (error) { + error = metaslab_alloc(spa, spa_log_class(spa), size, new_bp, 1, + txg, NULL, METASLAB_FASTWRITE, &io_alloc_list, NULL); + if (error == 0) { + *slog = TRUE; + } else { error = metaslab_alloc(spa, spa_normal_class(spa), size, new_bp, 1, txg, NULL, METASLAB_FASTWRITE, &io_alloc_list, NULL); + if (error == 0) + *slog = FALSE; } metaslab_trace_fini(&io_alloc_list); diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c index 1a86cd3cdc0c..bf9f48adb2f3 100644 --- a/module/zfs/zvol.c +++ b/module/zfs/zvol.c @@ -611,53 +611,44 @@ zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset, { uint32_t blocksize = zv->zv_volblocksize; zilog_t *zilog = zv->zv_zilog; - boolean_t slogging; - ssize_t immediate_write_sz; + itx_wr_state_t write_state; if (zil_replaying(zilog, tx)) return; - immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) - ? 0 : zvol_immediate_write_sz; - slogging = spa_has_slogs(zilog->zl_spa) && - (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); + if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) + write_state = WR_INDIRECT; + else if (!spa_has_slogs(zilog->zl_spa) && + size >= blocksize && blocksize > zvol_immediate_write_sz) + write_state = WR_INDIRECT; + else if (sync) + write_state = WR_COPIED; + else + write_state = WR_NEED_COPY; while (size) { itx_t *itx; lr_write_t *lr; - ssize_t len; - itx_wr_state_t write_state; + itx_wr_state_t wr_state = write_state; + ssize_t len = size; - /* - * Unlike zfs_log_write() we can be called with - * up to DMU_MAX_ACCESS/2 (5MB) writes. - */ - if (blocksize > immediate_write_sz && !slogging && - size >= blocksize && offset % blocksize == 0) { - write_state = WR_INDIRECT; /* uses dmu_sync */ - len = blocksize; - } else if (sync) { - write_state = WR_COPIED; - len = MIN(ZIL_MAX_LOG_DATA, size); - } else { - write_state = WR_NEED_COPY; - len = MIN(ZIL_MAX_LOG_DATA, size); - } + if (wr_state == WR_COPIED && size > ZIL_MAX_COPIED_DATA) + wr_state = WR_NEED_COPY; + else if (wr_state == WR_INDIRECT) + len = MIN(blocksize - P2PHASE(offset, blocksize), size); itx = zil_itx_create(TX_WRITE, sizeof (*lr) + - (write_state == WR_COPIED ? len : 0)); + (wr_state == WR_COPIED ? len : 0)); lr = (lr_write_t *)&itx->itx_lr; - if (write_state == WR_COPIED && dmu_read(zv->zv_objset, + if (wr_state == WR_COPIED && dmu_read(zv->zv_objset, ZVOL_OBJ, offset, len, lr+1, DMU_READ_NO_PREFETCH) != 0) { zil_itx_destroy(itx); itx = zil_itx_create(TX_WRITE, sizeof (*lr)); lr = (lr_write_t *)&itx->itx_lr; - write_state = WR_NEED_COPY; + wr_state = WR_NEED_COPY; } - itx->itx_wr_state = write_state; - if (write_state == WR_NEED_COPY) - itx->itx_sod += len; + itx->itx_wr_state = wr_state; lr->lr_foid = ZVOL_OBJ; lr->lr_offset = offset; lr->lr_length = len;