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SubjectRe: [PATCH] writeback: trace global_dirty_state
On Mon, Jun 13, 2011 at 10:33:56PM +0800, Jan Kara wrote:
> On Fri 10-06-11 22:48:05, Wu Fengguang wrote:
> > [It seems beneficial to queue this simple trace event for
> > next/upstream after the review?]
> >
> > Add trace event balance_dirty_state for showing the global dirty page
> > counts and thresholds at each global_dirty_limits() invocation. This
> > will cover the callers throttle_vm_writeout(), over_bground_thresh()
> > and each balance_dirty_pages() loop.
> OK, this might be useful. But shouldn't we also add similar trace point
> for bdi limits? Otherwise the information is of limited use...

Good point. The bdi limits will be exported in another
balance_dirty_pages trace point.

Thanks,
Fengguang


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