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[213.151.95.130]) by smtp.gmail.com with ESMTPSA id t10sm8734812wmi.40.2020.01.27.01.36.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Jan 2020 01:36:42 -0800 (PST) Date: Mon, 27 Jan 2020 10:36:42 +0100 From: Michal Hocko To: Wei Yang Cc: akpm@linux-foundation.org, yang.shi@linux.alibaba.com, rientjes@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [Patch v3 2/4] mm/migrate.c: wrap do_move_pages_to_node() and store_status() Message-ID: <20200127093642.GC1183@dhcp22.suse.cz> References: <20200126102623.9616-1-richardw.yang@linux.intel.com> <20200126102623.9616-3-richardw.yang@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200126102623.9616-3-richardw.yang@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun 26-01-20 18:26:21, Wei Yang wrote: > Usually do_move_pages_to_node() and store_status() is a pair. There are > three places call this pair of functions with almost the same form. > > This patch just wrap it to make it friendly to audience and also > consolidate the move and store action into one place. > > Signed-off-by: Wei Yang I believe I have already acked this one. Anyway Acked-by: Michal Hocko > --- > mm/migrate.c | 61 ++++++++++++++++++++++++++-------------------------- > 1 file changed, 30 insertions(+), 31 deletions(-) > > diff --git a/mm/migrate.c b/mm/migrate.c > index ae3db45c6a42..e816c8990296 100644 > --- a/mm/migrate.c > +++ b/mm/migrate.c > @@ -1583,6 +1583,29 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr, > return err; > } > > +static int move_pages_and_store_status(struct mm_struct *mm, int node, > + struct list_head *pagelist, int __user *status, > + unsigned long nr_pages, int start, int i) > +{ > + int err; > + > + err = do_move_pages_to_node(mm, pagelist, node); > + if (err) { > + /* > + * Positive err means the number of failed > + * pages to migrate. Since we are going to > + * abort and return the number of non-migrated > + * pages, so need incude the rest of the > + * nr_pages that have not attempted as well. > + */ > + if (err > 0) > + err += nr_pages - i - 1; > + return err; > + } > + err = store_status(status, start, node, i - start); > + return err; > +} > + > /* > * Migrate an array of page address onto an array of nodes and fill > * the corresponding array of status. > @@ -1626,20 +1649,9 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, > current_node = node; > start = i; > } else if (node != current_node) { > - err = do_move_pages_to_node(mm, &pagelist, current_node); > - if (err) { > - /* > - * Positive err means the number of failed > - * pages to migrate. Since we are going to > - * abort and return the number of non-migrated > - * pages, so need incude the rest of the > - * nr_pages that have not attempted as well. > - */ > - if (err > 0) > - err += nr_pages - i - 1; > - goto out; > - } > - err = store_status(status, start, current_node, i - start); > + err = move_pages_and_store_status(mm, current_node, > + &pagelist, status, nr_pages, > + start, i); > if (err) > goto out; > start = i; > @@ -1668,13 +1680,8 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, > if (err) > goto out_flush; > > - err = do_move_pages_to_node(mm, &pagelist, current_node); > - if (err) { > - if (err > 0) > - err += nr_pages - i - 1; > - goto out; > - } > - err = store_status(status, start, current_node, i - start); > + err = move_pages_and_store_status(mm, current_node, &pagelist, > + status, nr_pages, start, i); > if (err) > goto out; > current_node = NUMA_NO_NODE; > @@ -1684,16 +1691,8 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, > return err; > > /* Make sure we do not overwrite the existing error */ > - err1 = do_move_pages_to_node(mm, &pagelist, current_node); > - /* > - * Don't have to report non-attempted pages here since: > - * - If the above loop is done gracefully there is not non-attempted > - * page. > - * - If the above loop is aborted to it means more fatal error > - * happened, should return err. > - */ > - if (!err1) > - err1 = store_status(status, start, current_node, i - start); > + err1 = move_pages_and_store_status(mm, current_node, &pagelist, > + status, nr_pages, start, i); > if (err >= 0) > err = err1; > out: > -- > 2.17.1 -- Michal Hocko SUSE Labs