From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-186.mta1.migadu.com (out-186.mta1.migadu.com [95.215.58.186]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C79512566 for ; Wed, 3 Sep 2025 01:40:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.186 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756863604; cv=none; b=A6jYTG+TlF8NARX6MbrDmIJeOb76YpYlbf4htc0F76LtIqIgQVV7a076cWSiK7VJTBzpvki7TnQ8+zVVDK73VBJhhbs5Q/s3nhesWH4jC2ksv6aWXkbqVtqHwlCiq1tlrLh4RtBHMirXs5u82mhmtENCtsmRC/6SBDu+e8KWFJU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756863604; c=relaxed/simple; bh=GE4UrC/J5syH3kAVbQU7lQzrSUWTh8gemRAuUoE1WCQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=UG9DLJv807epXs6CcCR12IAVeuI/SdB6Zdip72VVQlPuOJVcbmV0vXoTpaCTvVmGegr1Vftl7j0clQNmbQjpI+MSNW/uoSqDZHh/3g2fIsRtxm7uD6wfqScDRaS8X5/xC0yLn971h/Nh1EVr1GoFzWFrleCKhCwC1HPil5i/L6Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=VWWYQ1yQ; arc=none smtp.client-ip=95.215.58.186 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="VWWYQ1yQ" Message-ID: <06c7a189-7ea2-4005-a1f2-12608fb2931e@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1756863599; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nBFnrycFy90OytnzxFhcHJdc8o4eGnhelby35FOE5H4=; b=VWWYQ1yQyLGa2x64akE37pTTcmFwUyCWMES7oeh7Gzd3h2W5kN4HNNW9NJXIN2+H4P9G+V N24WCyDrr7uCsLuT5sQvcY6Ibpe5BWJ6fYvJsn6v5FH3kvQDPjyv6FeVDxPYgMf7p9HSsK 3jP4FvdKFqz8D+3uytEsLaEmU+kaBWs= Date: Wed, 3 Sep 2025 09:39:44 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCH v2] mm: show_mem: show number of zspages in show_free_areas To: Thadeu Lima de Souza Cascardo , Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Minchan Kim , Sergey Senozhatsky , Yosry Ahmed , Nhat Pham , SeongJae Park , Lorenzo Stoakes Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-dev@igalia.com References: <20250902-show_mem_zspages-v2-1-545daaa8b410@igalia.com> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Chengming Zhou In-Reply-To: <20250902-show_mem_zspages-v2-1-545daaa8b410@igalia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT On 2025/9/2 20:49, Thadeu Lima de Souza Cascardo wrote: > When OOM is triggered, it will show where the pages might be for each zone. > When using zram or zswap, it might look like lots of pages are missing. > After this patch, zspages are shown as below. > > [ 48.792859] Node 0 DMA free:2812kB boost:0kB min:60kB low:72kB high:84kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB zspages:11160kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB > [ 48.792962] lowmem_reserve[]: 0 956 956 956 956 > [ 48.792988] Node 0 DMA32 free:3512kB boost:0kB min:3912kB low:4888kB high:5864kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:28kB active_file:8kB inactive_file:16kB unevictable:0kB writepending:0kB zspages:916780kB present:1032064kB managed:978944kB mlocked:0kB bounce:0kB free_pcp:500kB local_pcp:248kB free_cma:0kB > [ 48.793118] lowmem_reserve[]: 0 0 0 0 0 > > Signed-off-by: Thadeu Lima de Souza Cascardo Reviewed-by: Chengming Zhou Thanks! > --- > v2: > - fix build when CONFIG_ZSMALLOC is not enabled > --- > mm/show_mem.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/mm/show_mem.c b/mm/show_mem.c > index 41999e94a56d623726ea92f3f38785e8b218afe5..c563d9adfa87765a8736e91c1f68d824b03eaea8 100644 > --- a/mm/show_mem.c > +++ b/mm/show_mem.c > @@ -310,6 +310,7 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z > " inactive_file:%lukB" > " unevictable:%lukB" > " writepending:%lukB" > + " zspages:%lukB" > " present:%lukB" > " managed:%lukB" > " mlocked:%lukB" > @@ -332,6 +333,11 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z > K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE)), > K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)), > K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)), > +#if IS_ENABLED(CONFIG_ZSMALLOC) > + K(zone_page_state(zone, NR_ZSPAGES)), > +#else > + 0UL, > +#endif > K(zone->present_pages), > K(zone_managed_pages(zone)), > K(zone_page_state(zone, NR_MLOCK)), > > --- > base-commit: b320789d6883cc00ac78ce83bccbfe7ed58afcf0 > change-id: 20250902-show_mem_zspages-d090ea0bd1d4 > > Best regards,