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Message-ID: <d82e647a0907220645s109f487fva6d68a9abea68372@mail.gmail.com> Date: Wed, 22 Jul 2009 21:45:02 +0800 From: Ming Lei <tom.leiming@...il.com> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, mingo@...e.hu, torvalds@...ux-foundation.org Subject: Re: [tip:core/locking 2/3] lockdep:define preallocated "stack" for BFS as per cpu variable 2009/7/22 Peter Zijlstra <a.p.zijlstra@...llo.nl>: > On Wed, 2009-07-22 at 21:10 +0800, Ming Lei wrote: >> 2009/7/22 Peter Zijlstra <a.p.zijlstra@...llo.nl>: >> > On Wed, 2009-07-22 at 20:58 +0800, tom.leiming@...il.com wrote: >> >> From: Ming Lei <tom.leiming@...il.com> >> > >> > This patch can use a changelog. >> > >> > Why is this needed, isn't all that serialized by the graph_lock anyway? >> > Or are there a few paths where this isn't the case and we're now racy? >> >> It is really serialized by the graph_lock, but we can prevent cpu cache from >> being flushing by different cpu access, which seems that can be avoided by >> per cpu variables. Right? > > I doubt it'll make a difference, got any numbers to back that up? OK, I'll design some test case to get the numbers. Thanks. -- Lei Ming -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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