On Tue, 2010-05-25 at 23:32 +0800, Peter Zijlstra wrote:
> On Tue, 2010-05-25 at 17:02 +0200, Stephane Eranian wrote:
> > Ok, the patch look good expect it needs:
> >
> > static int x86_pmu_commit_txn(const struct pmu *pmu)
> > {
> > ......
> > /*
> > * copy new assignment, now we know it is possible
> > * will be used by hw_perf_enable()
> > */
> > memcpy(cpuc->assign, assign, n*sizeof(int));
> >
> > cpuc->n_txn = 0;
> >
> > return 0;
> > }
> >
> > Because you always call cancel_txn() even when commit()
> > succeeds. I don't really understand why. I think it could be
> > avoided by clearing the group_flag in commit_txn() if it
> > succeeds. It would also make the logical flow more natural. Why
> > cancel something that has succeeded. You cancel when you fail/abort.
>
> Gah, I forgot about that. I think I suggested to Lin to do that and then
> promptly forgot.
cancel_txn() clears the transaction flag, so it is needed after both
success and fail transaction, although the function name is a bit
misleading.
Peter's patch adds the clear of transaction flag into each
implementation of ->commit_txn.
So cancel_txn() is only called after fail transaction now.
Thanks,
Lin Ming
>
> Let me add that and at least push this patch fwd, we can try and clean
> up that detail later on.
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