On Sun, Jun 18, 2023 at 11:11:08AM -0700, Ira Weiny wrote: > Sumitra Sharma wrote: > > kmap() has been deprecated in favor of the kmap_local_page() > > due to high cost, restricted mapping space, the overhead of a > > global lock for synchronization, and making the process sleep > > in the absence of free slots. > > > > kmap_local_page() is faster than kmap() and offers thread-local > > and CPU-local mappings, take pagefaults in a local kmap region > > and preserves preemption by saving the mappings of outgoing tasks > > and restoring those of the incoming one during a context switch. > > > > The mapping is kept thread local in the function > > “i915_vma_coredump_create” in i915_gpu_error.c > > > > Therefore, replace kmap() with kmap_local_page(). > > > > Suggested-by: Ira Weiny <ira.weiny@xxxxxxxxx> > > > > NIT: No need for the line break between Suggested-by and your signed off line. > Hi Ira, What does NIT stand for? Thank you. I will take care about the line breaks. > > Signed-off-by: Sumitra Sharma <sumitraartsy@xxxxxxxxx> > > --- > > > > Changes in v2: > > - Replace kmap() with kmap_local_page(). > > Generally it is customary to attribute a change like this to those who > suggested it in a V1 review. > > For example: > > - Tvrtko/Thomas: Use kmap_local_page() instead of page_address() > > Also I don't see Thomas on the new email list. Since he took the time to > review V1 he might want to check this version out. I've added him to the > 'To:' list. > > Also a link to V1 is nice. B4 formats it like this: > > - Link to v1: https://lore.kernel.org/all/20230614123556.GA381200@xxxxxxxxxxx/ > > All that said the code looks good to me. So with the above changes. > > Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx> > I have noted down the points mentioned above. Thank you again. I am not supposed to create another version of this patch for adding the above mentions, as you and Thomas both gave this patch a reviewed-by tag. Right? Thanks & regards Sumitra PS: I am new to the open source vocabulary terms. > > - Change commit subject and message. > > > > drivers/gpu/drm/i915/i915_gpu_error.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c > > index f020c0086fbc..bc41500eedf5 100644 > > --- a/drivers/gpu/drm/i915/i915_gpu_error.c > > +++ b/drivers/gpu/drm/i915/i915_gpu_error.c > > @@ -1164,9 +1164,9 @@ i915_vma_coredump_create(const struct intel_gt *gt, > > > > drm_clflush_pages(&page, 1); > > > > - s = kmap(page); > > + s = kmap_local_page(page); > > ret = compress_page(compress, s, dst, false); > > - kunmap(page); > > + kunmap_local(s); > > > > drm_clflush_pages(&page, 1); > > > > -- > > 2.25.1 > > > >
