diff options
author | Christoph Hellwig <hch@lst.de> | 2014-04-25 13:32:53 +0400 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2014-04-25 18:24:07 +0400 |
commit | 38535201633077cbaf8b32886b5e3005b36c9024 (patch) | |
tree | ad94c4a3d3d7e1b47f2721ac36ab1698349e208d /block/blk-mq-sysfs.c | |
parent | 87ee7b112193bd081ba1a171fa5f6f39c429ef56 (diff) | |
download | linux-38535201633077cbaf8b32886b5e3005b36c9024.tar.xz |
blk-mq: respect rq_affinity
The blk-mq code is using it's own version of the I/O completion affinity
tunables, which causes a few issues:
- the rq_affinity sysfs file doesn't work for blk-mq devices, even if it
still is present, thus breaking existing tuning setups.
- the rq_affinity = 1 mode, which is the defauly for legacy request based
drivers isn't implemented at all.
- blk-mq drivers don't implement any completion affinity with the default
flag settings.
This patches removes the blk-mq ipi_redirect flag and sysfs file, as well
as the internal BLK_MQ_F_SHOULD_IPI flag and replaces it with code that
respects the queue-wide rq_affinity flags and also implements the
rq_affinity = 1 mode.
This means I/O completion affinity can now only be tuned block-queue wide
instead of per context, which seems more sensible to me anyway.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq-sysfs.c')
-rw-r--r-- | block/blk-mq-sysfs.c | 42 |
1 files changed, 0 insertions, 42 deletions
diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c index 9176a6984857..8145b5b25b4b 100644 --- a/block/blk-mq-sysfs.c +++ b/block/blk-mq-sysfs.c @@ -203,42 +203,6 @@ static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx, return ret; } -static ssize_t blk_mq_hw_sysfs_ipi_show(struct blk_mq_hw_ctx *hctx, char *page) -{ - ssize_t ret; - - spin_lock(&hctx->lock); - ret = sprintf(page, "%u\n", !!(hctx->flags & BLK_MQ_F_SHOULD_IPI)); - spin_unlock(&hctx->lock); - - return ret; -} - -static ssize_t blk_mq_hw_sysfs_ipi_store(struct blk_mq_hw_ctx *hctx, - const char *page, size_t len) -{ - struct blk_mq_ctx *ctx; - unsigned long ret; - unsigned int i; - - if (kstrtoul(page, 10, &ret)) { - pr_err("blk-mq-sysfs: invalid input '%s'\n", page); - return -EINVAL; - } - - spin_lock(&hctx->lock); - if (ret) - hctx->flags |= BLK_MQ_F_SHOULD_IPI; - else - hctx->flags &= ~BLK_MQ_F_SHOULD_IPI; - spin_unlock(&hctx->lock); - - hctx_for_each_ctx(hctx, ctx, i) - ctx->ipi_redirect = !!ret; - - return len; -} - static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page) { return blk_mq_tag_sysfs_show(hctx->tags, page); @@ -307,11 +271,6 @@ static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = { .attr = {.name = "pending", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_rq_list_show, }; -static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_ipi = { - .attr = {.name = "ipi_redirect", .mode = S_IRUGO | S_IWUSR}, - .show = blk_mq_hw_sysfs_ipi_show, - .store = blk_mq_hw_sysfs_ipi_store, -}; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = { .attr = {.name = "tags", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_tags_show, @@ -326,7 +285,6 @@ static struct attribute *default_hw_ctx_attrs[] = { &blk_mq_hw_sysfs_run.attr, &blk_mq_hw_sysfs_dispatched.attr, &blk_mq_hw_sysfs_pending.attr, - &blk_mq_hw_sysfs_ipi.attr, &blk_mq_hw_sysfs_tags.attr, &blk_mq_hw_sysfs_cpus.attr, NULL, |