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Thu, 22 Oct 2020 11:31:12 -0700 (PDT) Date: Thu, 22 Oct 2020 14:29:34 -0400 From: Johannes Weiner To: Rik van Riel Cc: Andrew Morton , Michal Hocko , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com Subject: Re: [PATCH] mm: memcontrol: add file_thp, shmem_thp to memory.stat Message-ID: <20201022182934.GA494712@cmpxchg.org> References: <20201022151844.489337-1-hannes@cmpxchg.org> <004fe66ee1d111ec006dd065b9bed5fdcfdaad01.camel@surriel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <004fe66ee1d111ec006dd065b9bed5fdcfdaad01.camel@surriel.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Oct 22, 2020 at 12:57:55PM -0400, Rik van Riel wrote: > On Thu, 2020-10-22 at 12:49 -0400, Rik van Riel wrote: > > On Thu, 2020-10-22 at 11:18 -0400, Johannes Weiner wrote: > > > > > index e80aa9d2db68..334ce608735c 100644 > > > --- a/mm/filemap.c > > > +++ b/mm/filemap.c > > > @@ -204,9 +204,9 @@ static void unaccount_page_cache_page(struct > > > address_space *mapping, > > > if (PageSwapBacked(page)) { > > > __mod_lruvec_page_state(page, NR_SHMEM, -nr); > > > if (PageTransHuge(page)) > > > - __dec_node_page_state(page, NR_SHMEM_THPS); > > > + __dec_lruvec_page_state(page, NR_SHMEM_THPS); > > > } else if (PageTransHuge(page)) { > > > - __dec_node_page_state(page, NR_FILE_THPS); > > > + __dec_lruvec_page_state(page, NR_FILE_THPS); > > > filemap_nr_thps_dec(mapping); > > > } > > > > This may be a dumb question, but does that mean the > > NR_FILE_THPS number will no longer be visible in > > /proc/vmstat or is there some magic I overlooked in > > a cursory look of the code? > > Never mind, I found it a few levels deep in > __dec_lruvec_page_state. No worries, it's a legit question. lruvec is at the intersection of node and memcg, so I'm just moving the accounting to a higher-granularity function that updates all layers, including the node. > Reviewed-by: Rik van Riel Thanks!