On Mon, 11 Oct 2021 at 16:45, Yongji Xie <xieyongji@xxxxxxxxxxxxx> wrote:
>
> On Mon, Oct 11, 2021 at 9:21 PM Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
> >
> > On Mon, 11 Oct 2021 at 11:07, Xie Yongji <xieyongji@xxxxxxxxxxxxx> wrote:
> > >
> > > Recently we found the performance of small direct writes is bad
> > > when writeback_cache enabled. This is because we need to get
> > > attrs from userspace in fuse_update_get_attr() on each write.
> > > The timeout for the attributes doesn't work since every direct write
> > > will invalidate the attrs in fuse_direct_IO().
> > >
> > > To fix it, this patch tries to avoid invalidating attrs if writeback_cache
> > > is enabled since we should trust local size/ctime/mtime in this case.
> >
> > Hi,
> >
> > Thanks for the patch.
> >
> > Just pushed an update to
> > git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.gitt#for-next
> > (9ca3f8697158 ("fuse: selective attribute invalidation")) that should
> > fix this behavior.
> >
>
> Looks like fuse_update_get_attr() will still get attrs from userspace
> each time with this commit applied.
>
> > Could you please test?
> >
>
> I applied the commit 9ca3f8697158 ("fuse: selective attribute
> invalidation") and tested it. But the issue still exists.
Yeah, my bad. Pushed a more complete set of fixes to #for-next ending with
e15a9a5fca6c ("fuse: take cache_mask into account in getattr")
You should pull or cherry pick the complete branch.
Thanks,
Miklos
