On Thu, Aug 24, 2006 at 12:11:25PM -0700, Badari Pulavarty wrote:
> > Why can't you just use alloc_page? I bet the whole slab overhead
> > eats more memory than what's wasted when using alloc_pages. Especially
> > as the typical usecase is a 4k blocks filesystem with 4k pagesize
> > where the overhead of alloc_page is non-existant.
>
> Yes. That was what proposed earlier. But for 1k, 2k allocations we
> end up wasting whole page. Isn't it ? Thats why I created right
> sized slabs and disable slab-debug. I guess, I can do this only for
> 1k, 2k filesystems and directly use alloc_page() for 4k and 8k - but
> that would make code ugly and also it doesn't handle cases for
> bigger base pagesize systems (64k power).
Is there some way we can cleanly have a shortcut case where we use
alloc_page() if fs_blocksize == PAGE_SIZE? The efficiency gains for
what will be the common case on many architectures will probably make
this worthwhile....
- Ted
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