when does linux kernel use swap, not only /proc/sys/vm/swappiness

seanlin138 · 2012-10-19 10:54:03

when does linux kernel use swap, i want to reappear it exactly, what is the Algorithm, how it relates to the value of /proc/sys/vm/swappiness,
i find a clause in 2.6.0, but don't know what it mean
swap_tendency = mapped_ratio / 2 + distress + vm_swappiness;

Last edited by seanlin138 (2012-10-20 01:52:13)

2ManyDogs · 2012-10-19 13:11:40

Welcome to Arch, seanlin138. You will find that Arch users are encouraged to answer questions like this for themselves, either by using the wiki (please see this topic, which I found by searching the wiki for "swappiness") or by using a web search.

The Arch wiki is an excellent source of information.

Last edited by 2ManyDogs (2012-10-19 13:14:57)

seanlin138 · 2012-10-20 01:25:06

thank 2ManyDogs so much.

seanlin138 · 2012-10-20 01:39:44

while i am not a e-country person, i have not describe my question clearly, i will modify the question.

Jristz · 2012-10-20 03:44:57

AS I know swappines in 2.6/3.x is 60 by default (a fixed value) and can by changed in /etc/sysctl.conf adding vm.swappiness to a value that you give, same for cache_pressure (as 100 as default) and reducted in same archive vm.vfs_cache_pressure

I think that this can help a little

seanlin138 · 2012-10-23 10:41:44

thanks

Arch Linux

#1 2012-10-19 10:54:03

when does linux kernel use swap, not only /proc/sys/vm/swappiness

#2 2012-10-19 13:11:40

Re: when does linux kernel use swap, not only /proc/sys/vm/swappiness

#3 2012-10-20 01:25:06

Re: when does linux kernel use swap, not only /proc/sys/vm/swappiness

#4 2012-10-20 01:39:44

Re: when does linux kernel use swap, not only /proc/sys/vm/swappiness

#5 2012-10-20 03:44:57

Re: when does linux kernel use swap, not only /proc/sys/vm/swappiness

#6 2012-10-23 10:41:44

Re: when does linux kernel use swap, not only /proc/sys/vm/swappiness

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