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SubjectRe: Page scan keeps touching kernel text pages
On Mon, 25 February 2008 09:48:22 -0800, Dave Hansen wrote:
> On Mon, 2008-02-25 at 15:07 +0000, Andy Whitcroft wrote:
> > shrink_page_list() would be expected to be passed pages pulled from
> > the active or inactive lists via isolate_lru_pages()? I would not have
> > expected to find the kernel text on the LRU and therefore not expect to
> > see it passed to shrink_page_list()?
>
> It may have been kernel text at one time, but what about __init
> functions? Don't we free that section back to the normal allocator
> after init time? Those can end up on the LRU.

Pages below 0x2ba should be non-init in my test kernel:
c02ba000 T __init_begin
...
c02d5000 B __init_end

scanning zone DMA
page 3fa 3 00000000 628
page 2bf 2 00000000 628
page 97 3 00000000 628
page 98 2 00000000 628

So __init explains one page of this minimal sample, but not the other
three.

Jörn

--
Never argue with idiots - first they drag you down to their level,
then they beat you with experience.
-- unknown
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