Re: Page fault scalability patch V18: Drop first acquisition of ptl

[Andrew Morton]

Christoph Lameter <clameter@xxxxxxx> wrote:
>
> On Wed, 2 Mar 2005, Andrew Morton wrote:
> 
>  > > Any mmap changes requires the mmapsem.
>  >
>  > sys_remap_file_pages() will call install_page() under down_read(mmap_sem).
>  > It relies upon page_table_lock for pte atomicity.
> 
>  This is not relevant since it only deals with file pages.

OK.   And CONFIG_DEBUG_PAGEALLOC?

> ptes are only
>  installed atomically for anonymous memory (if CONFIG_ATOMIC_OPS
>  is defined).

It's a shame.  A *nice* solution to this problem would address all pte ops
and wouldn't have such special cases...
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