[ovs-git] Open vSwitch: datapath: Correctly report flow used times for first 5 minutes after boot. (master)

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commit 4029c0435aa80f7a301f3915fe5eeaf38cb9ad44
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=4029c0435aa80f7a301f3915fe5eeaf38cb9ad44
Author: Ben Pfaff <blp at nicira.com>
		
datapath: Correctly report flow used times for first 5 minutes after boot.
		
The kernel starts out its "jiffies" timer as 5 minutes below zero, as
shown in include/linux/jiffies.h:

  /*
   * Have the 32 bit jiffies value wrap 5 minutes after boot
   * so jiffies wrap bugs show up earlier.
   */
  #define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))

The loop in ovs_flow_stats_get() starts out with 'used' set to 0, then
takes any "later" time.  This means that for the first five minutes after
boot, flows will always be reported as never used, since 0 is greater than
any time already seen.

Bug #1192516.
Signed-off-by: Ben Pfaff <blp at nicira.com>
Acked-by: Pravin B Shelar <pshelar at nicira.com>


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Summary of changes:
 datapath/flow.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)


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