On Sat, Apr 01, 2023 at 05:47:08PM +0800, Jinke Han <hanjinke.666@xxxxxxxxxxxxx> wrote:
> From: Jinke Han <hanjinke.666@xxxxxxxxxxxxx>
>
> After commit f382fb0bcef4 ("block: remove legacy IO schedulers"),
> blkio.throttle.io_serviced and blkio.throttle.io_service_bytes become
> the only stable io stats interface of cgroup v1,
There is also blkio.bfq.{io_serviced,io_service_bytes} couple, so it's
not the only. Or do you mean stable in terms of used IO scheduler?
> and these statistics are done in the blk-throttle code. But the
> current code only counts the bios that are actually throttled. When
> the user does not add the throttle limit,
... "or the limit doesn't kick in"
> the io stats for cgroup v1 has nothing.
> I fix it according to the statistical method of v2, and made it count
> all ios accurately.
s/all ios/all bios and split ios/
(IIUC you fix two things)
> Fixes: a7b36ee6ba29 ("block: move blk-throtl fast path inline")
Good catch.
Does it also undo the performance gain from that commit? (Or rather,
have you observed effect of your patch on v2-only performance?)
> Signed-off-by: Jinke Han <hanjinke.666@xxxxxxxxxxxxx>
> ---
> block/blk-cgroup.c | 6 ++++--
> block/blk-throttle.c | 6 ------
> block/blk-throttle.h | 9 +++++++++
> 3 files changed, 13 insertions(+), 8 deletions(-)
The code looks correct.
Thanks,
Michal
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