On Mon, Sep 10, 2018 at 7:21 AM, Kani, Toshi <toshi.kani@xxxxxxx> wrote: > On Mon, 2018-09-10 at 08:54 -0400, Jeff Moyer wrote: >> "Kani, Toshi" <toshi.kani@xxxxxxx> writes: >> >> > I noticed that both ext4_da_aops and ext4_dax_aops are used on DAX >> > mounted ext4 files. Looking at open() path: >> >> Eek. How did you notice this? > > I tested sync path on DAX files to see if it flushes processor cache > properly. Then I noticed that it sometimes does, but sometimes doesn't. > Looking into function traces, I realized that ext4_dax_writepages() and > ext4_writepages() are called depending on their file status. Yikes, and nice find!
