Messages in this thread |  | | | Date | Mon, 2 Apr 2007 20:58:25 -0700 | | From | Andrew Morton <> | | Subject | Re: [PATCH] Cleanup and kernelify shrinker registration (rc5-mm2) |
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On Tue, 03 Apr 2007 13:44:45 +1000 Rusty Russell <rusty@rustcorp.com.au> wrote:
> > I can never remember what the function to register to receive VM pressure > is called. I have to trace down from __alloc_pages() to find it. > > It's called "set_shrinker()", and it needs Your Help. > > New version: > 1) Don't hide struct shrinker. It contains no magic. > 2) Don't allocate "struct shrinker". It's not helpful. > 3) Call them "register_shrinker" and "unregister_shrinker". > 4) Call the function "shrink" not "shrinker". > 5) Rename "nr_to_scan" argument to "nr_to_free".
No, it is actually the number to scan. This is >= the number of freed objects.
This is because, for better of for worse, the VM tries to balance the scanning rate of the various caches, not the reclaiming rate.
> 6) Reduce the 17 lines of waffly comments to 10, and document the -1 return. > > Comments: > 1) The comment in reiserfs4 makes me a little queasy.
I'm going to have to split this patch up into mainline-bit and reiser4-bit.
And that's OK (it's a regular occurrence). But never miss a chance to whine.
> 2) The wrapper code in xfs might no longer be needed. > 3) The placing in the x86-64 "hot function list" for seems a little > unlikely. Clearly, Andi was testing if anyone was paying attention.
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