linux-kernel - Re: [PATCH -tip/master 3/7] locking/mcs: Remove obsolete comment

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Date:	Mon, 28 Jul 2014 18:54:26 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jason Low <jason.low2@...com>
Cc:	Davidlohr Bueso <davidlohr@...com>, mingo@...nel.org, aswin@...com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip/master 3/7] locking/mcs: Remove obsolete comment

On Mon, Jul 28, 2014 at 09:49:35AM -0700, Jason Low wrote:
> On Sun, 2014-07-27 at 22:18 -0700, Davidlohr Bueso wrote:
> > ... as we clearly inline mcs_spin_lock() now.
> > 
> > Signed-off-by: Davidlohr Bueso <davidlohr@...com>
> > ---
> >  kernel/locking/mcs_spinlock.h | 3 ---
> >  1 file changed, 3 deletions(-)
> > 
> > diff --git a/kernel/locking/mcs_spinlock.h b/kernel/locking/mcs_spinlock.h
> > index 23e89c5..4d60986 100644
> > --- a/kernel/locking/mcs_spinlock.h
> > +++ b/kernel/locking/mcs_spinlock.h
> > @@ -56,9 +56,6 @@ do {									\
> >   * If the lock has already been acquired, then this will proceed to spin
> >   * on this node->locked until the previous lock holder sets the node->locked
> >   * in mcs_spin_unlock().
> > - *
> > - * We don't inline mcs_spin_lock() so that perf can correctly account for the
> > - * time spent in this lock function.
> >   */
> >  static inline
> >  void mcs_spin_lock(struct mcs_spinlock **lock, struct mcs_spinlock *node)
> 
> Likewise, I'm wondering if we should make this function noinline so that
> "perf can correctly account for the time spent in this lock function".

What's that about anyhow? Surely perf can see where IPs come from? DWARF
has inline support after all.

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