Messages in this thread | | | From | KOSAKI Motohiro <> | Date | Mon, 2 Apr 2012 10:10:12 -0700 | Subject | Re: [RFC][PATCH] avoid swapping out with swappiness==0 |
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2012/3/30 Satoru Moriya <satoru.moriya@hds.com>: > Hello Kosaki-san, > > On 03/07/2012 01:18 PM, Satoru Moriya wrote: >> On 03/07/2012 12:19 PM, KOSAKI Motohiro wrote: >>> Thank you. I brought back to memory it. Unfortunately DB folks are >>> still mainly using RHEL5 generation distros. At that time, >>> swapiness=0 doesn't mean disabling swap. >>> >>> They want, "don't swap as far as kernel has any file cache page". but >>> linux don't have such feature. then they used swappiness for emulate >>> it. So, I think this patch clearly make userland harm. Because of, we >>> don't have an alternative way. > > As I wrote in the previous mail(see below), with this patch > the kernel begins to swap out when the sum of free pages and > filebacked pages reduces less than watermark_high. > > So the kernel reclaims pages like following. > > nr_free + nr_filebacked >= watermark_high: reclaim only filebacked pages > nr_free + nr_filebacked < watermark_high: reclaim only anonymous pages
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