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Date: Wed, 23 Sep 2015 21:45:53 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Patrick Marlier <patrick.marlier@...il.com> Cc: Steven Rostedt <rostedt@...dmis.org>, NeilBrown <neilb@...e.de>, linux-kernel@...r.kernel.org, mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com, josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org, dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com, wangyun@...ux.vnet.ibm.com Subject: Re: [PATCH tip/core/rcu 3/4] md/bitmap: Fix list_entry_rcu usage On Wed, Sep 23, 2015 at 07:57:53PM +0200, Patrick Marlier wrote: > > On 09/22/2015 10:50 PM, Paul E. McKenney wrote: > >On Sun, Sep 13, 2015 at 09:10:24AM -0700, Paul E. McKenney wrote: > >>On Sun, Sep 13, 2015 at 12:06:33PM +0200, Patrick Marlier wrote: > > > >[ . . . ] > > > >>>Paul, > >>> > >>>This sounds good to me. It should fix the performance issue (will > >>>check with my benchmark). > >> > >>Thank you, looking forward to seeing the results! > > > >Just following up -- how is the benchmarking going? > > Note that in my module I am using the kernel version 3.16.0-31 (I > ported your change). > Here the results of my benchmark that tests rculist in the case of > read only. > > # 1st column : The number of threads > # 2nd : ops/s the original version > # 3rd : ops/s your version with lockless_dereference > 1 883923 1747554 > 2 1741441 3543062 > 3 2462360 5103647 > 4 3437273 7176608 > 6 5155803 9812348 > 8 6718111 13330050 > 10 8519227 17458294 > 12 9773632 20298897 > 14 11555198 23191424 > 16 11643264 25125712 > > I get same performance with my patch. > So indeed it fixes the performance problem I was seeing. Nice, thank you!!! Thanx, Paul -- 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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