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    SubjectRe: [PATCH 0/4] writeback: tracing and wbc->nr_to_write fixes
    On 20/04/10 03:41, Dave Chinner wrote:
    > This series contains the initial writeback tracing patches from
    > Jens, as well as the extensions I added to provide visibility into
    > writeback control structures as the are used by the writeback code.
    > The visibility given is sufficient to understand what is happening
    > in the writeback path - what path is writing data, what path is
    > blocking on congestion, etc, and to determine the differences in
    > behaviour for different sync modes and calling contexts. This
    > tracing really needs to be integrated into mainline so that anyone
    > can improve the tracing as they use it to track down problems
    > in our convoluted writeback paths.
    > The remaining patches are fixes to problems that the new tracing
    > highlighted.

    Hi Dave,

    Thanks for adding tracing to this, it will be really useful.

    The fix to write_cache_pages looks really interesting, I'm going to test
    it on my machine. Maybe it should be a separate patch to get more

    Ext4 also multiplies nr_to_write, so will that need fixing too?


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