docs/mm: concepts.rst: Correct the threshold to low watermark

It should be "low watermark" where we wake up kswapd daemon.

Signed-off-by: Liao Pingfang <winndows@163.com>
Link: https://lore.kernel.org/r/1609053319-3112-1-git-send-email-winndows@163.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Liao Pingfang 2020-12-27 15:15:19 +08:00 committed by Jonathan Corbet
parent 81e7906300
commit c7e74b3c7b
1 changed files with 1 additions and 1 deletions

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@ -184,7 +184,7 @@ pages either asynchronously or synchronously, depending on the state
of the system. When the system is not loaded, most of the memory is free
and allocation requests will be satisfied immediately from the free
pages supply. As the load increases, the amount of the free pages goes
down and when it reaches a certain threshold (high watermark), an
down and when it reaches a certain threshold (low watermark), an
allocation request will awaken the ``kswapd`` daemon. It will
asynchronously scan memory pages and either just free them if the data
they contain is available elsewhere, or evict to the backing storage