Re: Bug#605009: serious performance regression with ext4
Mike Hommey, le Tue 30 Nov 2010 10:07:55 +0100, a écrit :
> On Mon, Nov 29, 2010 at 07:18:17AM +0100, Guillem Jover wrote:
> > > What's going on here? sync_file_range() is a Linux specific system
> > > call that has been around for a while. It allows program to control
> > > when writeback happens in a very low-level fashion. The first set of
> > > sync_file_range() system calls causes the system to start writing back
> > > each file once it has finished being extracted. It doesn't actually
> > > wait for the write to finish; it just starts the writeback.
> >
> > Hmm, ok so what about posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED)
> > instead, skimming over the kernel source seems to indicate it might
> > end up doing more or less the same thing but in a portable way?
>
> On the other hand, there is no guarantee that other kernels do the same,
Err, that's posix.
Samuel
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