On Sat, Mar 04, 2017 at 10:35:32AM +0000, Chris Wilson wrote: > Before we instantiate/pin the backing store for our use, we > can prepopulate the shmemfs filp efficiently using the a > write into the pagecache. We avoid the penalty of instantiating > all the pages, important if the user is just writing to a few > and never uses the object on the GPU, and using a direct write > into shmemfs allows it to avoid the cost of retrieving a page > (either swapin or clearing-before-use) before it is overwritten. > > This can be extended later to provide additional specialisation for > other backends (other than shmemfs). > > References: https://bugs.freedesktop.org/show_bug.cgi?id=99107 > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Matthew Auld <matthew.william.auld@xxxxxxxxx> > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> Whether to treat this as Fixes: fe115628d567 ("drm/i915: Implement pwrite without struct-mutex") Cc: <stable@xxxxxxxxxxxxxxx> # v4.10+ ? It prevents libva from taking the box down with it, so the impact is severe enough that I think so - but it's not a fix, just a workaround. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
