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Mon, 28 Mar 2022 17:45:35 -0700 (PDT) Date: Tue, 29 Mar 2022 00:45:35 +0000 From: Wei Yang To: Miaohe Lin Cc: "Huang, Ying" , 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: <20220329004535.27ps6cy4sipisxsu@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> <8ff6f619-e04a-d785-fa9a-6822c04d4ee1@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8ff6f619-e04a-d785-fa9a-6822c04d4ee1@huawei.com> User-Agent: NeoMutt/20170113 (1.7.2) X-Stat-Signature: ot6ohioni5g8zfr5akt4frd8i1ispecf Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=Pzmjcl1q; spf=pass (imf08.hostedemail.com: domain of richard.weiyang@gmail.com designates 209.85.218.54 as permitted sender) smtp.mailfrom=richard.weiyang@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 1251B160015 X-HE-Tag: 1648514736-393713 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 03:23:49PM +0800, Miaohe Lin wrote: >On 2022/3/28 9:08, 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? > >This patch looks good to me too. Thanks! > >BTW: This makes me remember the bewilderment when I read the relevant code. >It's very kind of you if you could tell me the difference between >managed_zone and populated_zone. IIUC, when the caller relies on the The difference is managed_zone means the zone has pages managed by buddy, while populated_zone means the zone has pages but may be reserved. >activity from buddy system, managed_zone should always be used. I think >there're many places like compaction need to use managed_zone but >populated_zone is used now. They might need to change to use managed_zone >too. Or am I miss something? This thread comes from the read of commit 6aa303defb74, which adjust the vmscan code. It looks like there is some mis-use in compaction, but I didn't get time to go through it. > >Many Thanks. :) -- Wei Yang Help you, Help me