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Mon, 1 Sep 2025 18:54:27 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id QtsBJePrtWgDHwAAD6G6ig (envelope-from ); Mon, 01 Sep 2025 18:54:27 +0000 Message-ID: Date: Mon, 1 Sep 2025 20:54:27 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: show_mem: show number of zspages in show_free_areas Content-Language: en-US To: Thadeu Lima de Souza Cascardo , linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, Andrew Morton , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , kernel-dev@igalia.com, Minchan Kim , Sergey Senozhatsky , Yosry Ahmed , Nhat Pham , Chengming Zhou References: <20250901183729.3900578-1-cascardo@igalia.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20250901183729.3900578-1-cascardo@igalia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: AA1E940002 X-Stat-Signature: bwx48qqt8obnrqzbsbxthusjxe4rj4mo X-Rspam-User: X-HE-Tag: 1756752869-457186 X-HE-Meta: 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 AWhsZs66 qagavg9N1eUttk0lzYRtL3sK7QEFEwDHk9Eps7wn9ZVtEcD3RUJ+rjSyVXt/pn8x0mab+v/RQse2xsLr33XEYN3MX/pZF9olQf7f6uO/uDhdR2ScUSKJKQHn2FNGOVVPWS8yAep11nLgKkc/9aak83CQFgBBkIOVjuZVw97ACym28O4ZyMI8AzChS8hDAqS6DXPI7YHcC+kSnIRcd7dfmefNMdyH3NmHWcddcJwmqQ8Pu/uU9GSMYw799yNxAs/OnlJLtQR1O+blIDdVoK6+EoszTAWz6UvzsLn99GnXdBysCkEPHTx3YSuEcxLZjBwsIVJnqm1/xKw62XpHrE6VmFcPlGHJye4MgX6k8Z4OGF+z4frMAMIjxeiQQopJl1tSHGBq4f8iBjf9Uj5s= 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: List-Subscribe: List-Unsubscribe: On 9/1/25 20:37, Thadeu Lima de Souza Cascardo wrote: > When OOM is triggered, it will show where the pages might be for each zone. > When using zram, it might look like lots of pages are missing. After this > patch, zspages are shown as below. AFAIK zswap can also use zsmalloc so this would be reported for zswap with the same effect too, right? > [ 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 Acked-by: Vlastimil Babka > --- > mm/show_mem.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/mm/show_mem.c b/mm/show_mem.c > index 41999e94a56d..ecf20a93ea54 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 +333,7 @@ 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)), > + K(zone_page_state(zone, NR_ZSPAGES)), > K(zone->present_pages), > K(zone_managed_pages(zone)), > K(zone_page_state(zone, NR_MLOCK)),