Re: [patch] my latest oom stuff
Billy Harvey (Billy.Harvey@thrillseeker.net)
Sat, 24 Oct 1998 22:57:15 -0400
Linus Torvalds wrote:
>
> Btw, Andrea, if you find the CPU looping busily in "kswapd", could you try
> to instrument it a bit more?
>
> The thing is, kswapd shouldn't even _allow_ that kind of endless looping.
> It forces itself to sleep at regular intervals by doing
>
> current->state = TASK_INTERRUPTIBLE;
> schedule();
>
> inside its loop. So even if we're really low on memory, it should always
> allow other processes to run for at least a fractional jiffy (after which
> the timer tick will wake it up again). Certainly long enough for another
> process to notice that it ran out of memory and kill itself.
Linus, FWIW in a non-measured case, I've noticed the kswapd
occassionally take 90% CPU (with top) if I run without any swap (144M
RAM), but if I add 128M swap, I never see it. In fact, with the swap
active, it hardly ever gets used, but seems to really affect the system
with none available.
Billy
--
Billy.Harvey@thrillseeker.net
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/