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Groups > linux.kernel > #1230944 > unrolled thread
| Started by | "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> |
|---|---|
| First post | 2015-09-22 23:00 +0200 |
| Last post | 2015-09-24 06:50 +0200 |
| Articles | 3 — 2 participants |
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Re: [PATCH tip/core/rcu 3/4] md/bitmap: Fix list_entry_rcu usage "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-09-22 23:00 +0200
Re: [PATCH tip/core/rcu 3/4] md/bitmap: Fix list_entry_rcu usage Patrick Marlier <patrick.marlier@gmail.com> - 2015-09-23 20:00 +0200
Re: [PATCH tip/core/rcu 3/4] md/bitmap: Fix list_entry_rcu usage "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-09-24 06:50 +0200
| From | "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> |
|---|---|
| Date | 2015-09-22 23:00 +0200 |
| Subject | Re: [PATCH tip/core/rcu 3/4] md/bitmap: Fix list_entry_rcu usage |
| Message-ID | <qbCPo-8bs-9@gated-at.bofh.it> |
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? Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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| From | Patrick Marlier <patrick.marlier@gmail.com> |
|---|---|
| Date | 2015-09-23 20:00 +0200 |
| Message-ID | <qbWuL-2YN-45@gated-at.bofh.it> |
| In reply to | #1230944 |
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. Thanks a lot! -- Pat -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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| From | "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> |
|---|---|
| Date | 2015-09-24 06:50 +0200 |
| Message-ID | <qc6DL-ZJ-1@gated-at.bofh.it> |
| In reply to | #1231614 |
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@vger.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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