[ovs-git] Open vSwitch: timeval: Remove backtrace feature. (master)

[dev at openvswitch.org]

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- Log -----------------------------------------------------------------
commit 94f3e5269e93e85001b078fd475217c997bbba70
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=94f3e5269e93e85001b078fd475217c997bbba70
Author: Ben Pfaff <blp at nicira.com>
		
timeval: Remove backtrace feature.
		
The backtrace feature of timeval is useful because it provides a "poor
man's profile" view of Open vSwitch.  But it is not likely to be useful in
a multithreaded process, because signal delivery doesn't necessarily follow
the profile when there is more than one thread.  (A signal in a
multithreaded process are delivered to an arbitrary thread.)

Another problem with the backtrace feature is that it is difficult for
format_backtraces() to synchronize properly with the signal handler in a
multithreaded process.  In a single-threaded process, it can just block
the signal handler, but in a multithreaded process this does not prevent
signal delivery to threads other than the one running format_backtrace().

Signed-off-by: Ben Pfaff <blp at nicira.com>
Acked-by: Ed Maste <emaste at freebsd.org>


-----------------------------------------------------------------------

Summary of changes:
 lib/poll-loop.c |    6 ---
 lib/timeval.c   |  157 -------------------------------------------------------
 lib/timeval.h   |    1 -
 3 files changed, 164 deletions(-)


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