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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-14 15:32:19 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-14 15:32:19 -0800 |
commit | e2c5923c349c1738fe8fda980874d93f6fb2e5b6 (patch) | |
tree | b97a90170c45211bcc437761653aa8016c34afcd /block/blk-stat.c | |
parent | abc36be236358162202e86ad88616ff95a755101 (diff) | |
parent | a04b5de5050ab8b891128eb2c47a0916fe8622e1 (diff) | |
download | linux-0-day-e2c5923c349c1738fe8fda980874d93f6fb2e5b6.tar.gz linux-0-day-e2c5923c349c1738fe8fda980874d93f6fb2e5b6.tar.xz |
Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block
Pull core block layer updates from Jens Axboe:
"This is the main pull request for block storage for 4.15-rc1.
Nothing out of the ordinary in here, and no API changes or anything
like that. Just various new features for drivers, core changes, etc.
In particular, this pull request contains:
- A patch series from Bart, closing the whole on blk/scsi-mq queue
quescing.
- A series from Christoph, building towards hidden gendisks (for
multipath) and ability to move bio chains around.
- NVMe
- Support for native multipath for NVMe (Christoph).
- Userspace notifications for AENs (Keith).
- Command side-effects support (Keith).
- SGL support (Chaitanya Kulkarni)
- FC fixes and improvements (James Smart)
- Lots of fixes and tweaks (Various)
- bcache
- New maintainer (Michael Lyle)
- Writeback control improvements (Michael)
- Various fixes (Coly, Elena, Eric, Liang, et al)
- lightnvm updates, mostly centered around the pblk interface
(Javier, Hans, and Rakesh).
- Removal of unused bio/bvec kmap atomic interfaces (me, Christoph)
- Writeback series that fix the much discussed hundreds of millions
of sync-all units. This goes all the way, as discussed previously
(me).
- Fix for missing wakeup on writeback timer adjustments (Yafang
Shao).
- Fix laptop mode on blk-mq (me).
- {mq,name} tupple lookup for IO schedulers, allowing us to have
alias names. This means you can use 'deadline' on both !mq and on
mq (where it's called mq-deadline). (me).
- blktrace race fix, oopsing on sg load (me).
- blk-mq optimizations (me).
- Obscure waitqueue race fix for kyber (Omar).
- NBD fixes (Josef).
- Disable writeback throttling by default on bfq, like we do on cfq
(Luca Miccio).
- Series from Ming that enable us to treat flush requests on blk-mq
like any other request. This is a really nice cleanup.
- Series from Ming that improves merging on blk-mq with schedulers,
getting us closer to flipping the switch on scsi-mq again.
- BFQ updates (Paolo).
- blk-mq atomic flags memory ordering fixes (Peter Z).
- Loop cgroup support (Shaohua).
- Lots of minor fixes from lots of different folks, both for core and
driver code"
* 'for-4.15/block' of git://git.kernel.dk/linux-block: (294 commits)
nvme: fix visibility of "uuid" ns attribute
blk-mq: fixup some comment typos and lengths
ide: ide-atapi: fix compile error with defining macro DEBUG
blk-mq: improve tag waiting setup for non-shared tags
brd: remove unused brd_mutex
blk-mq: only run the hardware queue if IO is pending
block: avoid null pointer dereference on null disk
fs: guard_bio_eod() needs to consider partitions
xtensa/simdisk: fix compile error
nvme: expose subsys attribute to sysfs
nvme: create 'slaves' and 'holders' entries for hidden controllers
block: create 'slaves' and 'holders' entries for hidden gendisks
nvme: also expose the namespace identification sysfs files for mpath nodes
nvme: implement multipath access to nvme subsystems
nvme: track shared namespaces
nvme: introduce a nvme_ns_ids structure
nvme: track subsystems
block, nvme: Introduce blk_mq_req_flags_t
block, scsi: Make SCSI quiesce and resume work reliably
block: Add the QUEUE_FLAG_PREEMPT_ONLY request queue flag
...
Diffstat (limited to 'block/blk-stat.c')
-rw-r--r-- | block/blk-stat.c | 45 |
1 files changed, 7 insertions, 38 deletions
diff --git a/block/blk-stat.c b/block/blk-stat.c index c52356d90fe38..3a2f3c96f3672 100644 --- a/block/blk-stat.c +++ b/block/blk-stat.c @@ -11,8 +11,6 @@ #include "blk-mq.h" #include "blk.h" -#define BLK_RQ_STAT_BATCH 64 - struct blk_queue_stats { struct list_head callbacks; spinlock_t lock; @@ -23,45 +21,21 @@ static void blk_stat_init(struct blk_rq_stat *stat) { stat->min = -1ULL; stat->max = stat->nr_samples = stat->mean = 0; - stat->batch = stat->nr_batch = 0; -} - -static void blk_stat_flush_batch(struct blk_rq_stat *stat) -{ - const s32 nr_batch = READ_ONCE(stat->nr_batch); - const s32 nr_samples = READ_ONCE(stat->nr_samples); - - if (!nr_batch) - return; - if (!nr_samples) - stat->mean = div64_s64(stat->batch, nr_batch); - else { - stat->mean = div64_s64((stat->mean * nr_samples) + - stat->batch, - nr_batch + nr_samples); - } - - stat->nr_samples += nr_batch; - stat->nr_batch = stat->batch = 0; + stat->batch = 0; } +/* src is a per-cpu stat, mean isn't initialized */ static void blk_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src) { - blk_stat_flush_batch(src); - if (!src->nr_samples) return; dst->min = min(dst->min, src->min); dst->max = max(dst->max, src->max); - if (!dst->nr_samples) - dst->mean = src->mean; - else { - dst->mean = div64_s64((src->mean * src->nr_samples) + - (dst->mean * dst->nr_samples), - dst->nr_samples + src->nr_samples); - } + dst->mean = div_u64(src->batch + dst->mean * dst->nr_samples, + dst->nr_samples + src->nr_samples); + dst->nr_samples += src->nr_samples; } @@ -69,13 +43,8 @@ static void __blk_stat_add(struct blk_rq_stat *stat, u64 value) { stat->min = min(stat->min, value); stat->max = max(stat->max, value); - - if (stat->batch + value < stat->batch || - stat->nr_batch + 1 == BLK_RQ_STAT_BATCH) - blk_stat_flush_batch(stat); - stat->batch += value; - stat->nr_batch++; + stat->nr_samples++; } void blk_stat_add(struct request *rq) @@ -84,7 +53,7 @@ void blk_stat_add(struct request *rq) struct blk_stat_callback *cb; struct blk_rq_stat *stat; int bucket; - s64 now, value; + u64 now, value; now = __blk_stat_time(ktime_to_ns(ktime_get())); if (now < blk_stat_time(&rq->issue_stat)) |