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perf top: Fix zero or negative refresh delay

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If perf top is executed with a zero value for the refresh rate,
we get a division by zero exception while computing samples_per_sec.

Also a zero refresh rate is not possible, neither do we want to
accept negative values.

[ Impact: fix division by zero in perf top ]

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1244223061-5399-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2009-06-05 19:31:01 +02:00 committed by Ingo Molnar
parent 1dba15e74a
commit 2f335a02b3
1 changed files with 3 additions and 0 deletions
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3
Documentation/perf_counter/builtin-top.c
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@ -693,6 +693,9 @@ int cmd_top(int argc, const char **argv, const char *prefix)
event_id[0] = 0; event_id[0] = 0;
} }
if (delay_secs < 1)
delay_secs = 1;
for (counter = 0; counter < nr_counters; counter++) { for (counter = 0; counter < nr_counters; counter++) {
if (event_count[counter]) if (event_count[counter])
continue; continue;