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Date: Sun, 19 Jan 2014 20:16:08 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: LKML <linux-kernel@...r.kernel.org>, lkp@...ux.intel.com
Subject: [rcu] c0f4dfd4f9: -65% softirqs.RCU
Hi Paul,
Just FYI, we noticed the following changes (which looks good) on old commit
c0f4dfd4f9 ("rcu: Make RCU_FAST_NO_HZ take advantage of numbered callbacks")
in test case dd-write/4HDD-JBOD-cfq-btrfs-1dd:
b11cc5 (parent) c0f4dfd4f90f1667d234d21f1
--------------- -------------------------
213757 ~ 4% -65.4% 73929 ~ 3% softirqs.RCU
21193 ~ 5% -36.5% 13451 ~ 4% softirqs.SCHED
2036 ~ 4% -59.4% 825 ~ 3% vmstat.system.cs
1304520 ~ 4% -59.2% 532451 ~ 3% perf-stat.context-switches
95685 ~ 4% -44.0% 53598 ~ 2% perf-stat.cpu-migrations
The "~ N%" numbers are stddev percent.
perf-stat.cpu-migrations
120000 ++----------------------------------------------------------------+
| |
110000 ++ * * *. * **. |
100000 *+ .* * :+ :: + *.* : : : * .* |
| * *. + +: * : : * : : : : + .* : |
90000 ++ * * + : * : * * * *.* |
| * * |
80000 ++ |
| |
70000 ++ |
60000 ++ |
| O O O O O O O O O O O O O O O O
50000 O+ OO O O O O O OO O O O O O OO O |
| O O O O |
40000 ++----------------------------------------------------------------+
perf-stat.context-switches
1.5e+06 ++---------------------------------------------------------------+
1.4e+06 ++ * * * *. * *.*.* * |
*. .** : + :+ + *. + ** + :+ : + + |
1.3e+06 ++* + : * *.* * + .* * *.* ** |
1.2e+06 ++ * * |
1.1e+06 ++ |
1e+06 ++ |
| |
900000 ++ |
800000 ++ |
700000 ++ |
600000 ++O O O |
O OO O OO O O O O OO O O OO O O OO O O OO O O O O O O O
500000 ++ O O OO |
400000 ++---------------------------------------------------------------+
vmstat.system.cs
2400 ++------------------------------------------------------------------+
| * *. *. * *. * * |
2200 *+ .*.* *. + + : *. + *.* + + + * + + + |
2000 ++* :+ * *.* * *.* * *.* *.* |
| * |
1800 ++ |
1600 ++ |
| |
1400 ++ |
1200 ++ |
| |
1000 ++O OO O |
800 O+ O OO O O O O O O O O O O O OO O O O O OO O O O O O O O
| O O O O |
600 ++------------------------------------------------------------------+
Thanks,
Fengguang
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