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
