Yafang, >> >> > The force_empty will also drop the pagecache pages, which is not >> > expected by us. >> >> force_empty is intended to reclaim _all_ pages. >> >> > The global drop_caches can't work either because it will drop slabs in >> > other memcgs. >> > That is why I want to introduce per memcg drop_caches. >> >> Problems with negative dentries has been already discussed in the past. >> I believe there was no conclusion so far. Please try to dig into >> archives. > >I have read the proposal of Waiman. But it seems there isn't a conclusion yet. >If the kernel can't fix this issue perfectly, then giving the user a >chance to work around it would be a possible solution - drop_caches is >that kind of workaround. I am sorry for failing to follow up on the negative dentry patches. Is your reason of doing this patch primarily because of the negative dentry build-up? Uncontrollable negative dentry buildup is a problem that should be addressed. I will work on an updated patch and post it ASAP. Cheers, Longman
