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Wed, 08 Apr 2020 17:54:10 -0700 (PDT) MIME-Version: 1.0 References: <1585892447-32059-1-git-send-email-iamjoonsoo.kim@lge.com> <20200406115804.4440-1-hdanton@sina.com> <20200407022144.11164-1-hdanton@sina.com> In-Reply-To: <20200407022144.11164-1-hdanton@sina.com> From: Joonsoo Kim Date: Thu, 9 Apr 2020 09:53:59 +0900 Message-ID: Subject: Re: [PATCH v5 05/10] mm/swap: charge the page when adding to the swap cache To: Hillf Danton Cc: Andrew Morton , Linux Memory Management List , LKML , Johannes Weiner , Michal Hocko , Hugh Dickins , Minchan Kim , Vlastimil Babka , Mel Gorman Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.220184, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 2020=EB=85=84 4=EC=9B=94 7=EC=9D=BC (=ED=99=94) =EC=98=A4=EC=A0=84 11:21, H= illf Danton =EB=8B=98=EC=9D=B4 =EC=9E=91=EC=84=B1: > > > On Tue, 7 Apr 2020 09:42:54 +0900 Joonsoo Kim wrote: > > > > 2020=3DEB=3D85=3D84 4=3DEC=3D9B=3D94 6=3DEC=3D9D=3DBC (=3DEC=3D9B=3D94)= =3DEC=3D98=3DA4=3DED=3D9B=3D84 8:58, Hi=3D > > llf Danton =3DEB=3D8B=3D98=3DEC=3D9D=3DB4 =3DEC=3D9E= =3D91=3DEC=3D84=3DB1: > > > > > > > > > On Fri, 3 Apr 2020 14:40:43 +0900 Joonsoo Kim wrote: > > > > > > > > @@ -153,11 +165,16 @@ int add_to_swap_cache(struct page *page, swp_= entr=3D > > y_t entry, > > > > xas_unlock_irq(&xas); > > > > } while (xas_nomem(&xas, gfp)); > > > > > > > > - if (!xas_error(&xas)) > > > > + if (!xas_error(&xas)) { > > > > + mem_cgroup_commit_charge(page, memcg, false, compound= ); > > > > > > Add a tp > > > trace_mm_add_to_swap_cache(page); > > > > Please let me know the reason of this comment. > > It is derived from > > trace_mm_filemap_add_to_page_cache(page); > > in __add_to_page_cache_locked(). Maybe, it has it's own purpose and it would not be applied here. If someone want to add a tp here, it can be done with a justification, after this patchset. Thanks.