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[209.85.220.65]) by mx.google.com with SMTPS id 21sor8789406ywg.189.2019.04.24.12.41.10 for (Google Transport Security); Wed, 24 Apr 2019 12:41:10 -0700 (PDT) Received-SPF: pass (google.com: domain of shakeelb@google.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=HSQGlCAB; spf=pass (google.com: domain of shakeelb@google.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=shakeelb@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Yniv5sy+5BQNRUjtlaSRpscFDyrU4/SisoLwlgAM2ng=; b=HSQGlCABvRIZPxZA8AOq9czRV7ZfXLMVbzQJ3+KvICA6fAiq4fTXLdIW4I9pcAK5Ar J+DJ/nbaXuY3mcsBwclwSQbl8CvBRvPVpIS3X80Q33eYOZKD7jYDyFucYjA3EpdqGupt K2FB85/z9856MjrPeLO6FF0Jm97fu+CWhTWj1Vdn3CGKACt4d1cJFkbwKCIGLs/yOjCd MngXQA1Gc0EtXw+FzBHSUypHSaaqwPOeSCyBaCn8Hus3JFZtQSJIdPAtrU1hGAOOuF+/ g1VzjfOuDMEfuueQgSzVFMoHMKMeE5PDBn3VG6Wr6EjzwrAJY4zJq+5zS72iouyIgmNg XZwQ== X-Google-Smtp-Source: APXvYqxv1u3H9ygt4AZH9qpNsjBSq/NfXcClQxIBs/Dob2wUtNxoudJC/96BrFm+ew0Zx5DOFe/D9zIl/Nygshyc5hM= X-Received: by 2002:a0d:f804:: with SMTP id i4mr28081368ywf.345.1556134869972; Wed, 24 Apr 2019 12:41:09 -0700 (PDT) MIME-Version: 1.0 References: <20190423213133.3551969-1-guro@fb.com> <20190423213133.3551969-5-guro@fb.com> <20190424191706.GA26707@tower.DHCP.thefacebook.com> In-Reply-To: <20190424191706.GA26707@tower.DHCP.thefacebook.com> From: Shakeel Butt Date: Wed, 24 Apr 2019 12:40:59 -0700 Message-ID: Subject: Re: [PATCH v2 4/6] mm: unify SLAB and SLUB page accounting To: Roman Gushchin Cc: Andrew Morton , Linux MM , LKML , Kernel Team , Johannes Weiner , Michal Hocko , Rik van Riel , Christoph Lameter , Vladimir Davydov , Cgroups Content-Type: text/plain; charset="UTF-8" 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 Wed, Apr 24, 2019 at 12:17 PM Roman Gushchin wrote: > > On Wed, Apr 24, 2019 at 10:23:45AM -0700, Shakeel Butt wrote: > > Hi Roman, > > > > On Tue, Apr 23, 2019 at 9:30 PM Roman Gushchin wrote: > > > > > > Currently the page accounting code is duplicated in SLAB and SLUB > > > internals. Let's move it into new (un)charge_slab_page helpers > > > in the slab_common.c file. These helpers will be responsible > > > for statistics (global and memcg-aware) and memcg charging. > > > So they are replacing direct memcg_(un)charge_slab() calls. > > > > > > Signed-off-by: Roman Gushchin > > > --- > > > mm/slab.c | 19 +++---------------- > > > mm/slab.h | 22 ++++++++++++++++++++++ > > > mm/slub.c | 14 ++------------ > > > 3 files changed, 27 insertions(+), 28 deletions(-) > > > > > > diff --git a/mm/slab.c b/mm/slab.c > > > index 14466a73d057..53e6b2687102 100644 > > > --- a/mm/slab.c > > > +++ b/mm/slab.c > > > @@ -1389,7 +1389,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, > > > int nodeid) > > > { > > > struct page *page; > > > - int nr_pages; > > > > > > flags |= cachep->allocflags; > > > > > > @@ -1399,17 +1398,11 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, > > > return NULL; > > > } > > > > > > - if (memcg_charge_slab(page, flags, cachep->gfporder, cachep)) { > > > + if (charge_slab_page(page, flags, cachep->gfporder, cachep)) { > > > __free_pages(page, cachep->gfporder); > > > return NULL; > > > } > > > > > > - nr_pages = (1 << cachep->gfporder); > > > - if (cachep->flags & SLAB_RECLAIM_ACCOUNT) > > > - mod_lruvec_page_state(page, NR_SLAB_RECLAIMABLE, nr_pages); > > > - else > > > - mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE, nr_pages); > > > - > > > __SetPageSlab(page); > > > /* Record if ALLOC_NO_WATERMARKS was set when allocating the slab */ > > > if (sk_memalloc_socks() && page_is_pfmemalloc(page)) > > > @@ -1424,12 +1417,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, > > > static void kmem_freepages(struct kmem_cache *cachep, struct page *page) > > > { > > > int order = cachep->gfporder; > > > - unsigned long nr_freed = (1 << order); > > > - > > > - if (cachep->flags & SLAB_RECLAIM_ACCOUNT) > > > - mod_lruvec_page_state(page, NR_SLAB_RECLAIMABLE, -nr_freed); > > > - else > > > - mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE, -nr_freed); > > > > > > BUG_ON(!PageSlab(page)); > > > __ClearPageSlabPfmemalloc(page); > > > @@ -1438,8 +1425,8 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page) > > > page->mapping = NULL; > > > > > > if (current->reclaim_state) > > > - current->reclaim_state->reclaimed_slab += nr_freed; > > > - memcg_uncharge_slab(page, order, cachep); > > > + current->reclaim_state->reclaimed_slab += 1 << order; > > > + uncharge_slab_page(page, order, cachep); > > > __free_pages(page, order); > > > } > > > > > > diff --git a/mm/slab.h b/mm/slab.h > > > index 4a261c97c138..0f5c5444acf1 100644 > > > --- a/mm/slab.h > > > +++ b/mm/slab.h > > > @@ -205,6 +205,12 @@ ssize_t slabinfo_write(struct file *file, const char __user *buffer, > > > void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **); > > > int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **); > > > > > > +static inline int cache_vmstat_idx(struct kmem_cache *s) > > > +{ > > > + return (s->flags & SLAB_RECLAIM_ACCOUNT) ? > > > + NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE; > > > +} > > > + > > > #ifdef CONFIG_MEMCG_KMEM > > > > > > /* List of all root caches. */ > > > @@ -352,6 +358,22 @@ static inline void memcg_link_cache(struct kmem_cache *s, > > > > > > #endif /* CONFIG_MEMCG_KMEM */ > > > > > > +static __always_inline int charge_slab_page(struct page *page, > > > + gfp_t gfp, int order, > > > + struct kmem_cache *s) > > > +{ > > > + memcg_charge_slab(page, gfp, order, s); > > > > This does not seem right. Why the return of memcg_charge_slab is ignored? > > Hi Shakeel! > > Right, it's a bug. It's actually fixed later in the patchset > (in "mm: rework non-root kmem_cache lifecycle management"), > so the final result looks correct to me. Anyway, I'll fix it. > > How does everything else look to you? > > Thank you! I caught this during quick glance. Another high level issue I found is breakage of /proc/kpagecgroup for the slab pages which is easy to fix. At the moment I am kind of stuck on some other stuff but will get back to this in a week or so. Shakeel