[PATCH] 2.2.14 VM fix #3

[Andrea Arcangeli]

On Fri, 21 Jan 2000, Rik van Riel wrote:

>Hi Alan, Andrea,
>
>here is my 3rd patch for the VM troubles. It has merged
>parts of Andrea's patch with my patch and does some extra
>improvements.

Sorry but I will never agree with your patch. The GFP_KERNEL change is not
something for 2.2.x. We have major deadlocks in getblk for example and you
may trigger tham more easily forbidding GFP_MID allocations to succeed. I
don't really see why you do these changes. What problem do you had on your
machine related to that? Such change sure won't help atomic allocations. Your
change only make a difference if we are oom.

Also killing the low_on_memory will harm performance. You doesn't seems to
see what such bit (that should be a per-process thing) is good for.

And the 1-second polling loop has to be killed since it make no sense.

>- below freepages.low, kswapd is immediately woken up,

Yes, using freepages.low is way better than my original freepages.high. I
noticed that this night after posting the patch. Anyway it's a
performance-only issue (see my other email) where I am providing an
incremental patch and a new version of my patch.

Andrea


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