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d="scan'208";a="287043806" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Sep 2021 07:06:10 -0700 X-IronPort-AV: E=Sophos;i="5.85,311,1624345200"; d="scan'208";a="549502391" Received: from yhuang6-desk2.sh.intel.com (HELO yhuang6-desk2.ccr.corp.intel.com) ([10.239.159.119]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Sep 2021 07:06:05 -0700 From: "Huang, Ying" To: Weizhao Ouyang Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Anshuman Khandual , Michal Hocko , John Hubbard , Pavel Tatashin , Yang Shi , Zi Yan , Dave Hansen , Minchan Kim , Mina Almasry , "Matthew Wilcox (Oracle)" , Oscar Salvador , Wei Xu Subject: Re: [PATCH v2 2/2] mm/debug: sync up latest migrate_reason to migrate_reason_names References: <20210921064553.293905-1-o451686892@gmail.com> <20210921064553.293905-3-o451686892@gmail.com> <87mto676fq.fsf@yhuang6-desk2.ccr.corp.intel.com> Date: Tue, 21 Sep 2021 22:06:03 +0800 In-Reply-To: (Weizhao Ouyang's message of "Tue, 21 Sep 2021 15:31:27 +0800") Message-ID: <87ee9i6n1w.fsf@yhuang6-desk2.ccr.corp.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=ascii X-Stat-Signature: f61h1gzkjxxctsrjntoy54r3smnpmxa5 Authentication-Results: imf03.hostedemail.com; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=intel.com (policy=none); spf=none (imf03.hostedemail.com: domain of ying.huang@intel.com has no SPF policy when checking 134.134.136.100) smtp.mailfrom=ying.huang@intel.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 3C43530000A6 X-HE-Tag: 1632233910-259261 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000017, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Weizhao Ouyang writes: > On 2021/9/21 15:07, Huang, Ying wrote: >> Weizhao Ouyang writes: >> >>> Sync up MR_DEMOTION to migrate_reason_names and add a synch prompt. >>> >>> Fixes: 26aa2d199d6f ("mm/migrate: demote pages during reclaim") >>> Signed-off-by: Weizhao Ouyang >>> Reviewed-by: "Huang, Ying" >>> --- >>> include/linux/migrate.h | 6 +++++- >>> mm/debug.c | 1 + >>> 2 files changed, 6 insertions(+), 1 deletion(-) >>> >>> diff --git a/include/linux/migrate.h b/include/linux/migrate.h >>> index 326250996b4e..c8077e936691 100644 >>> --- a/include/linux/migrate.h >>> +++ b/include/linux/migrate.h >>> @@ -19,6 +19,11 @@ struct migration_target_control; >>> */ >>> #define MIGRATEPAGE_SUCCESS 0 >>> >>> +/* >>> + * Keep sync with: >>> + * - macro MIGRATE_REASON in include/trace/events/migrate.h >>> + * - migrate_reason_names[MR_TYPES] in mm/debug.c >>> + */ >>> enum migrate_reason { >>> MR_COMPACTION, >>> MR_MEMORY_FAILURE, >>> @@ -32,7 +37,6 @@ enum migrate_reason { >>> MR_TYPES >>> }; >>> >>> -/* In mm/debug.c; also keep sync with include/trace/events/migrate.h */ >>> extern const char *migrate_reason_names[MR_TYPES]; >>> >>> #ifdef CONFIG_MIGRATION >>> diff --git a/mm/debug.c b/mm/debug.c >>> index e61037cded98..fae0f81ad831 100644 >>> --- a/mm/debug.c >>> +++ b/mm/debug.c >>> @@ -26,6 +26,7 @@ const char *migrate_reason_names[MR_TYPES] = { >>> "numa_misplaced", >>> "contig_range", >>> "longterm_pin", >>> + "demotion", >>> }; >>> >>> const struct trace_print_flags pageflag_names[] = { >> Can we add BUILD_BUG_ON() somewhere to capture at least some >> synchronization issue? > > Hi Huang, we discussed this in the v1 thread with you and John, seems you > missed it. Now we just add a comment to do the synchronization, and we can > figure out a more general way to use strings which in trace_events straight. Got it! And I think we can add the BUILD_BUG_ON() now and delete it when we have a better solution to deal with that. But if you can work out a better solution quickly, that's fine to ignore this. Best Regards, Huang, Ying