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Groups > linux.kernel > #1383075
| Path | csiph.com!aioe.org!bofh.it!news.nic.it!robomod |
|---|---|
| From | Alex Shi <lkml.alex@gmail.com> |
| Newsgroups | linux.kernel |
| Subject | Re: A mainline question about cgroup writeback |
| Date | Wed, 20 Apr 2016 08:40:01 +0200 |
| Message-ID | <rpTXP-3o7-1@gated-at.bofh.it> (permalink) |
| References | <rpygG-33S-13@gated-at.bofh.it> |
| X-Original-To | zhong jiang <zhongjiang@huawei.com> |
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| X-Original-Cc | Tejun Heo <tj@kernel.org>, Miao Xie <miaoxie@huawei.com>, lizefan@huawei.com, dingxiang@huawei.com, LKML <linux-kernel@vger.kernel.org> |
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It looks like a bug on cgroup writeback. Is this a regression or
consistent issue? If it's a regression, you may could do bisect to
find out the buggy commit.
On Tue, Apr 19, 2016 at 3:19 PM, zhong jiang <zhongjiang@huawei.com> wrote:
> cgroup writeback support the filesystem both ext4 and ext2.
> but, it appears to be not work when I test the function in the ext4.
> The example is as follows:
> echo "8:0 1048576" > blkio.throttle.write_bps_device
> echo $$ > cgroup.procs
> dd if=/dev/zero of=/test.c bs=1M count=10240
> 10240+0 records in
> 10240+0 records out
> 10737418240 bytes (11 GB) copied, 49.8796 s, 215 MB/s
>
> Furthering test find that the ratelimit will be limited if it write data
> to disk directly. Additionly, The read ratelimit is limited whther it go through
> the page cache or not.
>
> The kernel version is 4.6 I have tested, And the corresponding files
> in the attachment
--
Thanks
Alex
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Re: A mainline question about cgroup writeback Alex Shi <lkml.alex@gmail.com> - 2016-04-20 08:40 +0200
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