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Johannes Weiner 9682468747 mm: remove use-once cache bias from LRU balancing
When the splitlru patches divided page cache and swap-backed pages into
separate LRU lists, the pressure balance between the lists was biased to
account for the fact that streaming IO can cause memory pressure with a
flood of pages that are used only once.  New page cache additions would
tip the balance toward the file LRU, and repeat access would neutralize
that bias again.  This ensured that page reclaim would always go for
used-once cache first.

Since e986850598 ("mm,vmscan: only evict file pages when we have
plenty"), page reclaim generally skips over swap-backed memory entirely as
long as there is used-once cache present, and will apply the LRU balancing
when only repeatedly accessed cache pages are left - at which point the
previous use-once bias will have been neutralized.  This makes the
use-once cache balancing bias unnecessary.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Rik van Riel <riel@surriel.com>
Link: http://lkml.kernel.org/r/20200520232525.798933-7-hannes@cmpxchg.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-03 20:09:48 -07:00
arch mm/hugetlb: define a generic fallback for arch_clear_hugepage_flags() 2020-06-03 20:09:46 -07:00
block for-5.8/drivers-2020-06-01 2020-06-02 15:37:03 -07:00
certs
crypto
Documentation mm: allow swappiness that prefers reclaiming anon over the file workingset 2020-06-03 20:09:48 -07:00
drivers drm/i915: convert get_user_pages() --> pin_user_pages() 2020-06-03 20:09:42 -07:00
fs mm: fold and remove lru_cache_add_anon() and lru_cache_add_file() 2020-06-03 20:09:48 -07:00
include mm: fold and remove lru_cache_add_anon() and lru_cache_add_file() 2020-06-03 20:09:48 -07:00
init mm: memcontrol: make swap tracking an integral part of memory control 2020-06-03 20:09:48 -07:00
ipc
kernel mm: allow swappiness that prefers reclaiming anon over the file workingset 2020-06-03 20:09:48 -07:00
lib kasan: stop tests being eliminated as dead code with FORTIFY_SOURCE 2020-06-03 20:09:42 -07:00
LICENSES
mm mm: remove use-once cache bias from LRU balancing 2020-06-03 20:09:48 -07:00
net audit/stable-5.8 PR 20200601 2020-06-02 17:13:37 -07:00
samples Merge branch 'from-miklos' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-06-01 16:44:06 -07:00
scripts A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
security Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2020-06-02 17:36:24 -07:00
sound Merge branch 'akpm' (patches from Andrew) 2020-06-02 12:21:36 -07:00
tools khugepaged: introduce 'max_ptes_shared' tunable 2020-06-03 20:09:46 -07:00
usr
virt A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS for-5.8/drivers-2020-06-01 2020-06-02 15:37:03 -07:00
Makefile arm64 updates for 5.8 2020-06-01 15:18:27 -07:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.