Messages in this thread | | | Date | Tue, 21 Aug 2001 00:36:04 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: kswap spinning |
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On Mon, 20 Aug 2001, Marcelo Tosatti wrote:
> > Could you please boot with profile=2 and use readprofile to find out where > > kswapd is spending its time? > > Well, I've just noted Linus made kswapd loop as long as there is any > kind (inactive or free) shortage.
Well, duh. Let me explain.
>From mm/vmscan.c::kswapd() a short comment I wrote while implementing part of the current VM:
/* * We go to sleep if either the free page shortage * or the inactive page shortage is gone. We do this * because: * 1) we need no more free pages or * 2) the inactive pages need to be flushed to disk, * it wouldn't help to eat CPU time now ... * * We go to sleep for one second, but if it's needed * we'll be woken up earlier... */ if (!free_shortage() || !inactive_shortage()) { interruptible_sleep_on_timeout(&kswapd_wait, HZ);
I wonder when Linus lost his ability to read comments ;)
regards,
Rik -- IA64: a worthy successor to i860.
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