From: Mike Snitzer <snitzer@redhat.com>
To: Jens Axboe <axboe@kernel.dk>, Omar Sandoval <osandov@fb.com>
Cc: linux-block@vger.kernel.org, dm-devel@redhat.com,
Mikulas Patocka <mpatocka@redhat.com>
Subject: Re: [PATCH v4 0/7] per-cpu in_flight counters for bio-based drivers
Date: Thu, 6 Dec 2018 13:00:26 -0500 [thread overview]
Message-ID: <20181206180025.GA15514@redhat.com> (raw)
In-Reply-To: <20181206164122.2166-1-snitzer@redhat.com>
On Thu, Dec 06 2018 at 11:41am -0500,
Mike Snitzer <snitzer@redhat.com> wrote:
> Hey,
>
> This v4 addresses the compile issues on various archs when CONFIG_SMP
> isn't set (by introducing appropriate wrappers in genhd.h)
>
> Testing with this v4 I was unable to reproduce the issue you reported
> where iostat always reports 0 for avgqu-sz -- but please let me know
> if you still see problems like that.
I ran blktests and both block/017 and block/018 fail due to this
patchset's changes, I'm still trying to grok what the test result is
_saying_ but I'll hopefully get there soon:
block/017 (do I/O and check the inflight counter) [failed]
runtime ... 77.675s
--- tests/block/017.out 2018-12-06 12:31:21.457936217 -0500
+++ /home/git/blktests/results/nodev/block/017.out.bad 2018-12-06 12:36:15.735053586 -0500
@@ -1,14 +1,14 @@
Running block/017
-sysfs inflight reads 1
+sysfs inflight reads 2
sysfs inflight writes 0
-sysfs stat 1
-diskstats 1
-sysfs inflight reads 1
...
(Run 'diff -u tests/block/017.out /home/git/blktests/results/nodev/block/017.out.bad' to see the entire diff)
# diff -u tests/block/017.out /home/git/blktests/results/nodev/block/017.out.bad
--- tests/block/017.out 2018-12-06 12:31:21.457936217 -0500
+++ /home/git/blktests/results/nodev/block/017.out.bad 2018-12-06 12:51:36.695542332 -0500
@@ -1,14 +1,14 @@
Running block/017
-sysfs inflight reads 1
+sysfs inflight reads 2
sysfs inflight writes 0
-sysfs stat 1
-diskstats 1
-sysfs inflight reads 1
-sysfs inflight writes 1
sysfs stat 2
diskstats 2
-sysfs inflight reads 0
+sysfs inflight reads 2
+sysfs inflight writes 1
+sysfs stat 3
+diskstats 3
+sysfs inflight reads 1
sysfs inflight writes 0
-sysfs stat 0
-diskstats 0
+sysfs stat 1
+diskstats 1
Test complete
block/018 (do I/O and check iostats times) [failed]
runtime ... 156.073s
--- tests/block/018.out 2018-12-06 12:31:21.458936217 -0500
+++ /home/git/blktests/results/nodev/block/018.out.bad 2018-12-06 12:38:51.831116369 -0500
@@ -1,10 +1,10 @@
Running block/018
read 0 s
write 0 s
-read 1 s
+read 2 s
write 0 s
-read 1 s
...
(Run 'diff -u tests/block/018.out /home/git/blktests/results/nodev/block/018.out.bad' to see the entire diff)
# diff -u tests/block/018.out /home/git/blktests/results/nodev/block/018.out.bad
--- tests/block/018.out 2018-12-06 12:31:21.458936217 -0500
+++ /home/git/blktests/results/nodev/block/018.out.bad 2018-12-06 12:38:51.831116369 -0500
@@ -1,10 +1,10 @@
Running block/018
read 0 s
write 0 s
-read 1 s
+read 2 s
write 0 s
-read 1 s
-write 1 s
read 2 s
+write 1 s
+read 6 s
write 3 s
Test complete
next prev parent reply other threads:[~2018-12-06 18:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-06 16:41 [PATCH v4 0/7] per-cpu in_flight counters for bio-based drivers Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 1/7] dm: dont rewrite dm_disk(md)->part0.in_flight Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 2/7] dm rq: leverage blk_mq_queue_busy() to check for outstanding IO Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 3/7] block: stop passing 'cpu' to all percpu stats methods Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 4/7] block: delete part_round_stats and switch to less precise counting Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 5/7] block: switch to per-cpu in-flight counters Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 6/7] block: return just one value from part_in_flight Mike Snitzer
2018-12-06 16:41 ` [PATCH v4 7/7] dm: remove the pending IO accounting Mike Snitzer
2018-12-06 18:00 ` Mike Snitzer [this message]
2018-12-06 19:04 ` [PATCH v4 0/7] per-cpu in_flight counters for bio-based drivers Mike Snitzer
2018-12-10 15:35 ` Jens Axboe
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