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[PATCHSET,v3,0/3] Improve IOCB_NOWAIT O_DIRECT reads

Message ID 20210224164455.1096727-1-axboe@kernel.dk (mailing list archive)
Headers show
Series Improve IOCB_NOWAIT O_DIRECT reads | expand

Message

Jens Axboe Feb. 24, 2021, 4:44 p.m. UTC 
Hi,

For v1, see:

https://lore.kernel.org/linux-fsdevel/20210208221829.17247-1-axboe@kernel.dk/

tldr; don't -EAGAIN IOCB_NOWAIT dio reads just because we have page cache
entries for the given range. This causes unnecessary work from the callers
side, when the IO could have been issued totally fine without blocking on
writeback when there is none.

 fs/iomap/direct-io.c | 24 ++++++++++++++--------
 include/linux/fs.h   |  2 ++
 mm/filemap.c         | 47 ++++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 63 insertions(+), 10 deletions(-)

Andrew, any chance you can pick this up for 5.12?

Since v2:
- Drop overly long line (hch)
- Rebase to master, iomap changed flags to iomap_flags