On 28.01.25 12:10, Miklos Szeredi wrote:
On Mon, 27 Jan 2025 at 22:44, Joanne Koong <joannelkoong@xxxxxxxxx> wrote:
Hi all,
Hi,
Recently, there was a long discussion upstream [1] on a patchset that
removes temp pages when handling writeback in FUSE. Temp pages are the
main bottleneck for write performance in FUSE and local benchmarks
showed approximately a 20% and 45% improvement in throughput for 4K
and 1M block size writes respectively when temp pages were removed.
More information on how FUSE uses temp pages can be found here [2].
I'm obviously interested in this discussion :) Hoping I'll be able to
attend in person this year again (I assume so).
In the discussion, there were concerns from mm regarding the
possibility of untrusted malicious or buggy fuse servers never
completing writeback, which would impede migration for those pages.
It would be great to continue this discussion at LSF/MM and align on a
solution that removes FUSE temp pages altogether while satisfying mm’s
expectations for page migration. These are the most promising options
so far:
This is more than just temp pages. The same issue exists for
->readahead(). This needs to be approached from both directions.
Agreed.
--
Cheers,
David / dhildenb
