linux-kernel - [PATCH 0/3] mm,TPP: Enable promotion of unmapped pagecache

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-next>] [day] [month] [year] [list]

Message-ID: <20240803094715.23900-1-gourry@gourry.net>
Date: Sat,  3 Aug 2024 05:47:12 -0400
From: Gregory Price <gourry@...rry.net>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	david@...hat.com,
	ying.huang@...el.com,
	nphamcs@...il.com,
	nehagholkar@...a.com,
	abhishekd@...a.com
Subject: [PATCH 0/3] mm,TPP: Enable promotion of unmapped pagecache

Unmapped pagecache pages can be demoted to low-tier memory, but 
they can only be promoted if a process maps the pages into the
memory space (so that NUMA hint faults can be caught).  This can
cause significant performance degradation as the pagecache ages
and unmapped, cached files are accessed.

This patch series enables the pagecache to request a promotion of
a folio when it is accessed via the pagecache.

We add a new `numa_hint_page_cache` counter in vmstat to capture
information on when these migrations occur.

Gregory Price (3):
  migrate: Allow migrate_misplaced_folio APIs without a VMA
  memory: allow non-fault migration in numa_migrate_prep path
  swap: enable promotion for unmapped pagecache on access

 include/linux/migrate.h       |  6 ++----
 include/linux/vm_event_item.h |  1 +
 mm/huge_memory.c              |  2 +-
 mm/memory.c                   | 21 +++++++++++----------
 mm/mempolicy.c                | 25 +++++++++++++++++--------
 mm/migrate.c                  |  7 +++----
 mm/swap.c                     | 20 ++++++++++++++++++++
 mm/vmstat.c                   |  1 +
 8 files changed, 56 insertions(+), 27 deletions(-)

-- 
2.43.0