Messages in this thread | | | Date | Thu, 8 Jul 2021 05:20:53 +0100 | From | Christoph Hellwig <> | Subject | Re: page pools, was Re: [PATCH v9 1/5] drm: Add a sharable drm page-pool implementation |
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On Wed, Jul 07, 2021 at 12:35:23PM -0700, John Stultz wrote: > So, as Christian mentioned, on the TTM side it's useful, as they are > trying to avoid TLB flushes when changing caching attributes. > > For the dmabuf system heap purposes, the main benefit is moving the > page zeroing to the free path, rather than the allocation path. This > on its own doesn't save much, but allows us to defer frees (and thus > the zeroing) to the background, which can get that work out of the hot > path.
I really do no think that is worth it to fragment the free pages.
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