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Latest commit d3df046 Luca Porzio committed with storulf mmc: remove bondage between REQ_META and reliable write
Anytime a write operation is performed with Reliable Write flag enabled,
the eMMC device is enforced to bypass the cache and do a write to the
underling NVM device by Jedec specification; this causes a performance
penalty since write operations can't be optimized by the device cache.

In our tests, we replayed a typical mobile daily trace pattern and found
~9% overall time reduction in trace replay by using this patch. Also the
write ops within 4KB~64KB chunk size range get a 40~60% performance
improvement by using the patch (as this range of write chunks are the ones
affected by REQ_META).

This patch has been discussed in the Mobile & Embedded Linux Storage Forum
and it's the results of feedbacks from many people. We also checked with
fsdevl and f2fs mailing list developers that this change in the usage of
REQ_META is not affecting FS behavior and we got positive feedbacks.
Reporting here the feedbacks:

Signed-off-by: Bruce Ford <>
Signed-off-by: Luca Porzio <>
Fixes: ce39f9d ("mmc: support packed write command for eMMC4.5 devices")
Signed-off-by: Ulf Hansson <>
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card mmc: remove bondage between REQ_META and reliable write
core mmc: mmc: Improve reliability of mmc_select_hs400()
host mmc: MMC_GOLDFISH should depend on HAS_DMA
Makefile mmc: sdhci-pci: add platform data
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