From: Michal Hocko <mhocko@suse.cz> To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mel@csn.ul.ie>, Hugh Dickins <hughd@google.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Andi Kleen <andi@firstfloor.org>, Hillf Danton <dhillf@gmail.com>, linux-kernel@vger.kernel.org Subject: Re: [PATCH 02/10] migrate: make core migration code aware of hugepage Date: Tue, 26 Mar 2013 09:49:52 +0100 [thread overview] Message-ID: <20130326084952.GK2295@dhcp22.suse.cz> (raw) In-Reply-To: <1364272415-zvaphow7-mutt-n-horiguchi@ah.jp.nec.com> On Tue 26-03-13 00:33:35, Naoya Horiguchi wrote: > On Mon, Mar 25, 2013 at 11:57:01AM +0100, Michal Hocko wrote: > > On Fri 22-03-13 16:23:47, Naoya Horiguchi wrote: [...] > > > +int migrate_movable_pages(struct list_head *from, new_page_t get_new_page, > > > + unsigned long private, > > > + enum migrate_mode mode, int reason) > > > +{ > > > + int err = 0; > > > + > > > + if (!list_empty(from)) { > > > + err = migrate_pages(from, get_new_page, private, mode, reason); > > > + if (err) > > > + putback_movable_pages(from); > > > + } > > > + return err; > > > +} > > > + > > > > There doesn't seem to be any caller for this function. Please move it to > > the patch which uses it. > > I would do like that if there's only one user of this function, but I thought > that it's better to separate this part as changes of common code > because this function is commonly used by multiple users which are added by > multiple patches later in this series. Sure there is no hard rule for this. I just find it much easier to review if there is a caller of introduced functionality. In this particular case I found out only later that many migrate_pages callers were changed to use mograte_movable_pages and made the putback_movable_pages cleanup inconsistent between the two. It would help to mention what is the planned future usage of the introduced function if you prefer to introduce it without users. > I mean doing like > > Patch 1: core change > Patch 2: user A (depend on patch 1) > Patch 3: user B (depend on patch 1) > Patch 4: user C (depend on patch 1) > > is a bit cleaner and easier in bisecting than doing like > > Patch 1: core change + user A > Patch 2: user B (depend on patch 1) > Patch 3: user C (depend on patch 1) > > . I'm not sure which is standard or well-accepted way. Whatever makes the review easy ;) -- Michal Hocko SUSE Labs
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@suse.cz> To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mel@csn.ul.ie>, Hugh Dickins <hughd@google.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Andi Kleen <andi@firstfloor.org>, Hillf Danton <dhillf@gmail.com>, linux-kernel@vger.kernel.org Subject: Re: [PATCH 02/10] migrate: make core migration code aware of hugepage Date: Tue, 26 Mar 2013 09:49:52 +0100 [thread overview] Message-ID: <20130326084952.GK2295@dhcp22.suse.cz> (raw) In-Reply-To: <1364272415-zvaphow7-mutt-n-horiguchi@ah.jp.nec.com> On Tue 26-03-13 00:33:35, Naoya Horiguchi wrote: > On Mon, Mar 25, 2013 at 11:57:01AM +0100, Michal Hocko wrote: > > On Fri 22-03-13 16:23:47, Naoya Horiguchi wrote: [...] > > > +int migrate_movable_pages(struct list_head *from, new_page_t get_new_page, > > > + unsigned long private, > > > + enum migrate_mode mode, int reason) > > > +{ > > > + int err = 0; > > > + > > > + if (!list_empty(from)) { > > > + err = migrate_pages(from, get_new_page, private, mode, reason); > > > + if (err) > > > + putback_movable_pages(from); > > > + } > > > + return err; > > > +} > > > + > > > > There doesn't seem to be any caller for this function. Please move it to > > the patch which uses it. > > I would do like that if there's only one user of this function, but I thought > that it's better to separate this part as changes of common code > because this function is commonly used by multiple users which are added by > multiple patches later in this series. Sure there is no hard rule for this. I just find it much easier to review if there is a caller of introduced functionality. In this particular case I found out only later that many migrate_pages callers were changed to use mograte_movable_pages and made the putback_movable_pages cleanup inconsistent between the two. It would help to mention what is the planned future usage of the introduced function if you prefer to introduce it without users. > I mean doing like > > Patch 1: core change > Patch 2: user A (depend on patch 1) > Patch 3: user B (depend on patch 1) > Patch 4: user C (depend on patch 1) > > is a bit cleaner and easier in bisecting than doing like > > Patch 1: core change + user A > Patch 2: user B (depend on patch 1) > Patch 3: user C (depend on patch 1) > > . I'm not sure which is standard or well-accepted way. Whatever makes the review easy ;) -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2013-03-26 8:49 UTC|newest] Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-03-22 20:23 [PATCH v2 0/10] extend hugepage migration Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-22 20:23 ` [PATCH 01/10] migrate: add migrate_entry_wait_huge() Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-23 15:55 ` Rik van Riel 2013-03-23 15:55 ` Rik van Riel 2013-03-25 10:13 ` Michal Hocko 2013-03-25 10:13 ` Michal Hocko 2013-03-26 4:25 ` Naoya Horiguchi 2013-03-26 4:25 ` Naoya Horiguchi 2013-04-05 20:33 ` KOSAKI Motohiro 2013-04-05 20:33 ` KOSAKI Motohiro 2013-04-08 20:00 ` Naoya Horiguchi 2013-04-08 20:00 ` Naoya Horiguchi 2013-04-05 20:33 ` KOSAKI Motohiro 2013-04-05 20:33 ` KOSAKI Motohiro 2013-03-22 20:23 ` [PATCH 02/10] migrate: make core migration code aware of hugepage Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-25 10:57 ` Michal Hocko 2013-03-25 10:57 ` Michal Hocko 2013-03-26 4:33 ` Naoya Horiguchi 2013-03-26 4:33 ` Naoya Horiguchi 2013-03-26 8:49 ` Michal Hocko [this message] 2013-03-26 8:49 ` Michal Hocko 2013-04-05 20:41 ` KOSAKI Motohiro 2013-04-05 20:41 ` KOSAKI Motohiro 2013-03-22 20:23 ` [PATCH 03/10] soft-offline: use migrate_pages() instead of migrate_huge_page() Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-25 12:31 ` Michal Hocko 2013-03-25 12:31 ` Michal Hocko 2013-03-26 4:34 ` Naoya Horiguchi 2013-03-26 4:34 ` Naoya Horiguchi 2013-03-26 9:49 ` Michal Hocko 2013-03-26 9:49 ` Michal Hocko 2013-03-26 20:35 ` Naoya Horiguchi 2013-03-26 20:35 ` Naoya Horiguchi 2013-03-27 13:00 ` Michal Hocko 2013-03-27 13:00 ` Michal Hocko 2013-04-05 21:11 ` KOSAKI Motohiro 2013-04-05 21:11 ` KOSAKI Motohiro 2013-03-26 11:29 ` Aneesh Kumar K.V 2013-03-26 11:29 ` Aneesh Kumar K.V 2013-03-27 13:52 ` Michal Hocko 2013-03-27 13:52 ` Michal Hocko 2013-03-27 19:19 ` Naoya Horiguchi 2013-03-27 19:19 ` Naoya Horiguchi 2013-03-28 8:53 ` Michal Hocko 2013-03-28 8:53 ` Michal Hocko 2013-03-29 5:26 ` Aneesh Kumar K.V 2013-03-29 5:26 ` Aneesh Kumar K.V 2013-03-29 9:36 ` Michal Hocko 2013-03-29 9:36 ` Michal Hocko 2013-04-01 5:13 ` Aneesh Kumar K.V 2013-04-01 5:13 ` Aneesh Kumar K.V 2013-04-02 9:45 ` Michal Hocko 2013-04-02 9:45 ` Michal Hocko 2013-03-22 20:23 ` [PATCH 04/10] migrate: clean up migrate_huge_page() Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-04-05 21:13 ` KOSAKI Motohiro 2013-04-05 21:13 ` KOSAKI Motohiro 2013-03-22 20:23 ` [PATCH 05/10] migrate: add hugepage migration code to migrate_pages() Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-25 13:04 ` Michal Hocko 2013-03-25 13:04 ` Michal Hocko 2013-03-26 5:13 ` Naoya Horiguchi 2013-03-26 5:13 ` Naoya Horiguchi 2013-03-26 8:55 ` Michal Hocko 2013-03-26 8:55 ` Michal Hocko 2013-04-05 21:17 ` KOSAKI Motohiro 2013-04-05 21:17 ` KOSAKI Motohiro 2013-04-08 20:21 ` Naoya Horiguchi 2013-04-08 20:21 ` Naoya Horiguchi 2013-03-22 20:23 ` [PATCH 06/10] migrate: add hugepage migration code to move_pages() Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-25 13:36 ` Michal Hocko 2013-03-25 13:36 ` Michal Hocko 2013-03-26 7:06 ` Naoya Horiguchi 2013-03-26 7:06 ` Naoya Horiguchi 2013-03-26 10:02 ` Michal Hocko 2013-03-26 10:02 ` Michal Hocko 2013-03-26 20:37 ` Naoya Horiguchi 2013-03-26 20:37 ` Naoya Horiguchi 2013-03-22 20:23 ` [PATCH 07/10] mbind: add hugepage migration code to mbind() Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-25 13:49 ` Michal Hocko 2013-03-25 13:49 ` Michal Hocko 2013-04-05 22:23 ` KOSAKI Motohiro 2013-04-05 22:23 ` KOSAKI Motohiro 2013-04-06 7:04 ` Michal Hocko 2013-04-06 7:04 ` Michal Hocko 2013-04-05 22:18 ` KOSAKI Motohiro 2013-04-05 22:18 ` KOSAKI Motohiro 2013-04-08 20:25 ` Naoya Horiguchi 2013-04-08 20:25 ` Naoya Horiguchi 2013-03-22 20:23 ` [PATCH 08/10] migrate: remove VM_HUGETLB from vma flag check in vma_migratable() Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-22 20:23 ` [PATCH 09/10] memory-hotplug: enable memory hotplug to handle hugepage Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-25 15:09 ` Michal Hocko 2013-03-25 15:09 ` Michal Hocko 2013-03-26 18:23 ` Naoya Horiguchi 2013-03-26 18:23 ` Naoya Horiguchi 2013-03-27 14:19 ` Michal Hocko 2013-03-27 14:19 ` Michal Hocko 2013-03-27 21:29 ` Naoya Horiguchi 2013-03-27 21:29 ` Naoya Horiguchi 2013-03-27 21:58 ` Naoya Horiguchi 2013-03-27 21:58 ` Naoya Horiguchi 2013-03-27 22:55 ` Michal Hocko 2013-03-27 22:55 ` Michal Hocko 2013-03-26 12:01 ` Aneesh Kumar K.V 2013-03-26 12:01 ` Aneesh Kumar K.V 2013-03-27 19:28 ` Naoya Horiguchi 2013-03-27 19:28 ` Naoya Horiguchi 2013-04-06 0:13 ` KOSAKI Motohiro 2013-04-06 0:13 ` KOSAKI Motohiro 2013-04-09 20:07 ` Naoya Horiguchi 2013-04-09 20:07 ` Naoya Horiguchi 2013-04-09 21:27 ` KOSAKI Motohiro 2013-04-09 21:27 ` KOSAKI Motohiro 2013-04-09 22:43 ` Naoya Horiguchi 2013-04-09 22:43 ` Naoya Horiguchi 2013-04-10 1:56 ` KOSAKI Motohiro 2013-04-10 1:56 ` KOSAKI Motohiro 2013-04-10 2:24 ` Naoya Horiguchi 2013-04-10 2:24 ` Naoya Horiguchi 2013-03-22 20:23 ` [PATCH 10/10] prepare to remove /proc/sys/vm/hugepages_treat_as_movable Naoya Horiguchi 2013-03-22 20:23 ` Naoya Horiguchi 2013-03-25 15:12 ` Michal Hocko 2013-03-25 15:12 ` Michal Hocko 2013-04-06 0:15 ` KOSAKI Motohiro 2013-04-06 0:15 ` KOSAKI Motohiro
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20130326084952.GK2295@dhcp22.suse.cz \ --to=mhocko@suse.cz \ --cc=akpm@linux-foundation.org \ --cc=andi@firstfloor.org \ --cc=dhillf@gmail.com \ --cc=hughd@google.com \ --cc=kosaki.motohiro@jp.fujitsu.com \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-mm@kvack.org \ --cc=mel@csn.ul.ie \ --cc=n-horiguchi@ah.jp.nec.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.