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| author | Zhang Qiang <qiang.zhang@windriver.com> | 2021-04-15 19:19:56 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-05-11 01:00:48 +0200 |
| commit | d0bfa8b3c411e25e014e4131d2804afe29c440a6 (patch) | |
| tree | ce6873d2b15f3acc6f793e823518b0a7f068aa3c /Documentation/admin-guide | |
| parent | Linux 5.13-rc1 (diff) | |
| download | linux-d0bfa8b3c411e25e014e4131d2804afe29c440a6.tar.xz linux-d0bfa8b3c411e25e014e4131d2804afe29c440a6.zip | |
kvfree_rcu: Release a page cache under memory pressure
Add a drain_page_cache() function to drain a per-cpu page cache.
The reason behind of it is a system can run into a low memory
condition, in that case a page shrinker can ask for its users
to free their caches in order to get extra memory available for
other needs in a system.
When a system hits such condition, a page cache is drained for
all CPUs in a system. By default a page cache work is delayed
with 5 seconds interval until a memory pressure disappears, if
needed it can be changed. See a rcu_delay_page_cache_fill_msec
module parameter.
Co-developed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Zqiang <qiang.zhang@windriver.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index cb89dbdedc46..4405fd32e8ab 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4290,6 +4290,11 @@ whole algorithm to behave better in low memory condition. + rcutree.rcu_delay_page_cache_fill_msec= [KNL] + Set the page-cache refill delay (in milliseconds) + in response to low-memory conditions. The range + of permitted values is in the range 0:100000. + rcutree.jiffies_till_first_fqs= [KNL] Set delay from grace-period initialization to first attempt to force quiescent states. |