Re: [RFC PATCH v1 2/3] blk-cgroup: store blkcg in bio instead of blkg
Christoph Hellwig <[email protected]>
| Newsgroups | org.kernel.vger.linux-bcache,dev.linux.lists.dm-devel,dev.linux.lists.gfs2,dev.linux.lists.nvdimm,dev.linux.lists.virtualization,org.kernel.vger.cgroups,org.kernel.vger.linux-block,org.kernel.vger.linux-doc,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-kernel,org.kernel.vger.linux-raid,org.kvack.linux-mm |
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On Tue, Aug 04, 2026 at 11:30:55PM +0800, yu kuai wrote: > The problem here is that remove a cgroup can also remove the blkg from radix tree, > even through it still has active refcounts. I think this can be fixed by checking > the cgroup online_pin first, if it's zero, we can search the blkg from the > request_queue blkg list, where blkg will not be removed until blkg_free_workfn(). > What's better, if we can convert the blkg list to hash table with key as blk-cgroup, > it will be much better as we can lookup from this table instead of blkcg radix tree. Yes, I think you can really easily do that with the rhashtable.