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Groups > linux.kernel > #1383753 > unrolled thread
| Started by | Tejun Heo <tj@kernel.org> |
|---|---|
| First post | 2016-04-20 23:30 +0200 |
| Last post | 2016-04-21 10:50 +0200 |
| Articles | 2 — 2 participants |
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Re: A mainline question about cgroup writeback Tejun Heo <tj@kernel.org> - 2016-04-20 23:30 +0200
Re: A mainline question about cgroup writeback zhong jiang <zhongjiang@huawei.com> - 2016-04-21 10:50 +0200
| From | Tejun Heo <tj@kernel.org> |
|---|---|
| Date | 2016-04-20 23:30 +0200 |
| Subject | Re: A mainline question about cgroup writeback |
| Message-ID | <rq7R9-6eA-7@gated-at.bofh.it> |
On Tue, Apr 19, 2016 at 03:19:59PM +0800, zhong jiang 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 $$ > cgroup.procs > dd if=/dev/zero of=/test.c bs=1M count=10240 > 10240+0 records in > 10240+0 records out > 10737418240 bytes (11 GB) copied, 49.8796 s, 215 MB/s How much memory does the cgroup have available to it? It's buffered write. It might not get throttled if there are enough pages to dirty. Thanks. -- tejun
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| From | zhong jiang <zhongjiang@huawei.com> |
|---|---|
| Date | 2016-04-21 10:50 +0200 |
| Message-ID | <rqitb-6j1-5@gated-at.bofh.it> |
| In reply to | #1383753 |
On 2016/4/21 5:22, Tejun Heo wrote: > On Tue, Apr 19, 2016 at 03:19:59PM +0800, zhong jiang wrote: >> cgroup writeback support the filesystem both ext4 and ext2. >> but, it appears to be not work when I test the function in the ext4. >> The example is as follows: >> echo "8:0 1048576" > blkio.throttle.write_bps_device >> echo $$ > 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 > How much memory does the cgroup have available to it? It's buffered > write. It might not get throttled if there are enough pages to dirty. > > Thanks. > Maybe it's my fault. I just limit two fields in dirty_background_bytes and dirty_bytes , and I don't consider about the available memory in the cgroup. Thanks zhongjiang
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