Re: [PATCHSET v3 0/5] Support for RWF_UNCACHED

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On 12/11/19 7:21 PM, Matthew Wilcox wrote:
> On Wed, Dec 11, 2019 at 07:03:40PM -0700, Jens Axboe wrote:
>> Tested and cleaned a bit, and added truncate protection through
>> inode_dio_begin()/inode_dio_end().
>>
>> https://git.kernel.dk/cgit/linux-block/commit/?h=buffered-uncached&id=6dac80bc340dabdcbfb4230b9331e52510acca87
>>
>> This is much faster than the previous page cache dance, and I _think_
>> we're ok as long as we block truncate and hole punching.
> 
> What about races between UNCACHED and regular buffered IO?  Seems like
> we might end up sending overlapping writes to the device?

The UNCACHED out-of-page-cache IO is just for reads, it's not writes. The
write part is still using the same approach as earlier, though now I bet
it looks kinda slow compared to the read side...

-- 
Jens Axboe





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