linux-kernel - [PATCH v4 1/9] lib/show_mem.c: display MovableOnly

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230311003855.645684-2-opendmb@gmail.com>
Date:   Fri, 10 Mar 2023 16:38:47 -0800
From:   Doug Berger <opendmb@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jonathan Corbet <corbet@....net>, Mike Rapoport <rppt@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Kim Phillips <kim.phillips@....com>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
        Mel Gorman <mgorman@...e.de>,
        Muchun Song <songmuchun@...edance.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Sukadev Bhattiprolu <quic_sukadev@...cinc.com>,
        Rik van Riel <riel@...riel.com>,
        Roman Gushchin <guro@...com>, Minchan Kim <minchan@...nel.org>,
        Chris Goldsworthy <quic_cgoldswo@...cinc.com>,
        "Georgi Djakov" <quic_c_gdjako@...cinc.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Doug Berger <opendmb@...il.com>
Subject: [PATCH v4 1/9] lib/show_mem.c: display MovableOnly

The comment for commit c78e93630d15 ("mm: do not walk all of
system memory during show_mem") indicates it "also corrects the
reporting of HighMem as HighMem/MovableOnly as ZONE_MOVABLE has
similar problems to HighMem with respect to lowmem/highmem
exhaustion."

Presuming the similar problems are with regard to the general
exclusion of kernel allocations from either zone, I believe it
makes sense to include all ZONE_MOVABLE memory even on systems
without HighMem.

To the extent that this was the intent of the original commit I
have included a "Fixes" tag, but it seems unnecessary to submit
to linux-stable.

Fixes: c78e93630d15 ("mm: do not walk all of system memory during show_mem")
Signed-off-by: Doug Berger <opendmb@...il.com>
---
 lib/show_mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/show_mem.c b/lib/show_mem.c
index 0d7585cde2a6..6a632b0c35c5 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -27,7 +27,7 @@ void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
 			total += zone->present_pages;
 			reserved += zone->present_pages - zone_managed_pages(zone);
 
-			if (is_highmem_idx(zoneid))
+			if (zoneid == ZONE_MOVABLE || is_highmem_idx(zoneid))
 				highmem += zone->present_pages;
 		}
 	}
-- 
2.34.1