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4045 zfs write throttle & i/o scheduler performance work
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>


 855 
 856 /*
 857  * Initialize the io for a log block.
 858  */
 859 static void
 860 zil_lwb_write_init(zilog_t *zilog, lwb_t *lwb)
 861 {
 862         zbookmark_t zb;
 863 
 864         SET_BOOKMARK(&zb, lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET],
 865             ZB_ZIL_OBJECT, ZB_ZIL_LEVEL,
 866             lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ]);
 867 
 868         if (zilog->zl_root_zio == NULL) {
 869                 zilog->zl_root_zio = zio_root(zilog->zl_spa, NULL, NULL,
 870                     ZIO_FLAG_CANFAIL);
 871         }
 872         if (lwb->lwb_zio == NULL) {
 873                 lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa,
 874                     0, &lwb->lwb_blk, lwb->lwb_buf, BP_GET_LSIZE(&lwb->lwb_blk),
 875                     zil_lwb_write_done, lwb, ZIO_PRIORITY_LOG_WRITE,
 876                     ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE, &zb);
 877         }
 878 }
 879 
 880 /*
 881  * Define a limited set of intent log block sizes.
 882  *
 883  * These must be a multiple of 4KB. Note only the amount used (again
 884  * aligned to 4KB) actually gets written. However, we can't always just
 885  * allocate SPA_MAXBLOCKSIZE as the slog space could be exhausted.
 886  */
 887 uint64_t zil_block_buckets[] = {
 888     4096,               /* non TX_WRITE */
 889     8192+4096,          /* data base */
 890     32*1024 + 4096,     /* NFS writes */
 891     UINT64_MAX
 892 };
 893 
 894 /*
 895  * Use the slog as long as the logbias is 'latency' and the current commit size




 855 
 856 /*
 857  * Initialize the io for a log block.
 858  */
 859 static void
 860 zil_lwb_write_init(zilog_t *zilog, lwb_t *lwb)
 861 {
 862         zbookmark_t zb;
 863 
 864         SET_BOOKMARK(&zb, lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET],
 865             ZB_ZIL_OBJECT, ZB_ZIL_LEVEL,
 866             lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ]);
 867 
 868         if (zilog->zl_root_zio == NULL) {
 869                 zilog->zl_root_zio = zio_root(zilog->zl_spa, NULL, NULL,
 870                     ZIO_FLAG_CANFAIL);
 871         }
 872         if (lwb->lwb_zio == NULL) {
 873                 lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa,
 874                     0, &lwb->lwb_blk, lwb->lwb_buf, BP_GET_LSIZE(&lwb->lwb_blk),
 875                     zil_lwb_write_done, lwb, ZIO_PRIORITY_SYNC_WRITE,
 876                     ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE, &zb);
 877         }
 878 }
 879 
 880 /*
 881  * Define a limited set of intent log block sizes.
 882  *
 883  * These must be a multiple of 4KB. Note only the amount used (again
 884  * aligned to 4KB) actually gets written. However, we can't always just
 885  * allocate SPA_MAXBLOCKSIZE as the slog space could be exhausted.
 886  */
 887 uint64_t zil_block_buckets[] = {
 888     4096,               /* non TX_WRITE */
 889     8192+4096,          /* data base */
 890     32*1024 + 4096,     /* NFS writes */
 891     UINT64_MAX
 892 };
 893 
 894 /*
 895  * Use the slog as long as the logbias is 'latency' and the current commit size