tree 92e7aff1912c7950f16374e1b29d9951a5450140
parent 6ad6278bc581844e20f92c17957702a03552e1cb
author Jiawei Shao <jiawei.shao@intel.com> 1639101928 +0000
committer Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1639101928 +0000

dawn_wire: Directly use the data in deserialized buffer when possible

This patch tries to use the data directly in deserialized buffer
when the data is "data-only" and doesn't affect the control flow instead
of allocating and copying into a temporary buffer. Due to the protection
of TOCTOU attacks, currently we only set "wire_is_data_only" on the
parameter "data" in Queue.WriteBuffer() and Queue.WriteTexture().

With this patch, the performance of dawn_perf_tests
BufferUploadPerf.Run/*_WriteBuffer_BufferSize_* with "-w" will
be greatly improved (~20%) when the upload buffer size is greater than
1MB.

BUG=chromium:1266727

Change-Id: I7a9d54c9b505975235ee37aa72ee97f082ad3aa3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/72063
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>