Messages in this thread | | | Date | Wed, 19 Apr 2017 15:11:49 +0900 | From | Sergey Senozhatsky <> | Subject | Re: copy_page() on a kmalloc-ed page with DEBUG_SLAB enabled (was "zram: do not use copy_page with non-page alinged address") |
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On (04/18/17 13:06), Michal Hocko wrote: [..] > > > copy_page is a performance sensitive function and I believe that we do > > > those tricks exactly for this purpose. > > > > a wild thought, > > > > use > > #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) > > > > when DEBUG_SLAB is set? so arch copy_page() (if provided by arch) > > won't be affected otherwise. > > SLAB is not guaranteed to provide page size aligned object AFAIR.
oh, if there are no guarantees for page_sized allocations regardless the .config then agree, won't help.
-ss
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