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Mon, 28 Mar 2022 17:41:47 -0700 (PDT) Date: Tue, 29 Mar 2022 00:41:46 +0000 From: Wei Yang To: "Huang, Ying" Cc: Wei Yang , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, mgorman@techsingularity.net Subject: Re: [PATCH 2/2] mm/vmscan: make sure wakeup_kswapd with managed zone Message-ID: <20220329004146.2xdswvrm2qu7f47x@master> Reply-To: Wei Yang References: <20220327024101.10378-1-richard.weiyang@gmail.com> <20220327024101.10378-2-richard.weiyang@gmail.com> <8735j2opd9.fsf@yhuang6-desk2.ccr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8735j2opd9.fsf@yhuang6-desk2.ccr.corp.intel.com> User-Agent: NeoMutt/20170113 (1.7.2) X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 40CAF1C0002 X-Rspam-User: Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b="Tpg/+5Vb"; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf20.hostedemail.com: domain of richard.weiyang@gmail.com designates 209.85.218.45 as permitted sender) smtp.mailfrom=richard.weiyang@gmail.com X-Stat-Signature: 9kcycr1ha4tedc6cin619in6osedc1qi X-HE-Tag: 1648514509-710095 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 Mon, Mar 28, 2022 at 09:08:34AM +0800, Huang, Ying wrote: >Hi, Wei, > >Wei Yang writes: > >> wakeup_kswapd() only wake up kswapd when the zone is managed. >> >> For two callers of wakeup_kswapd(), they are node perspective. >> >> * wake_all_kswapds >> * numamigrate_isolate_page >> >> If we picked up a !managed zone, this is not we expected. >> >> This patch makes sure we pick up a managed zone for wakeup_kswapd(). >> >> Signed-off-by: Wei Yang >> --- >> mm/migrate.c | 2 +- >> mm/page_alloc.c | 2 ++ >> 2 files changed, 3 insertions(+), 1 deletion(-) >> >> diff --git a/mm/migrate.c b/mm/migrate.c >> index 3d60823afd2d..c4b654c0bdf0 100644 >> --- a/mm/migrate.c >> +++ b/mm/migrate.c >> @@ -2046,7 +2046,7 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page) >> if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING)) >> return 0; >> for (z = pgdat->nr_zones - 1; z >= 0; z--) { >> - if (populated_zone(pgdat->node_zones + z)) >> + if (managed_zone(pgdat->node_zones + z)) > >This looks good to me! Thanks! It seems that we can replace >populated_zone() in migrate_balanced_pgdat() too. Right? > Yes, you are right. I didn't spot this. While this patch comes from the clue of wakeup_kswapd(), I am not sure it is nice to put it in this patch together. Which way you prefer to include this: merge the change into this one, or a separate one? -- Wei Yang Help you, Help me