From: Peter Zijlstra Date: Tue, 24 Mar 2009 09:50:24 +0000 (+0100) Subject: perf_counter tools: remove glib dependency and fix bugs in kerneltop.c, fix poll() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0fd112e41cd6f6d4779cbe327c3632d087e31476;p=linux-beck.git perf_counter tools: remove glib dependency and fix bugs in kerneltop.c, fix poll() Paul Mackerras wrote: > I noticed the poll stuff is bogus - we have a 2D array of struct > pollfds (MAX_NR_CPUS x MAX_COUNTERS), we fill in a sub-array (with the > rest being uninitialized, since the array is on the stack) and then > pass the first nr_cpus elements to poll. Not what we really meant, I > suspect. :) Not even if we only have one counter, since it's the > counter dimension that varies fastest. This should fix the most obvious poll fubar.. not enough to fix the full problem though.. Reported-by: Paul Mackerras Reported-by: Mike Galbraith Signed-off-by: Peter Zijlstra Cc: Arjan van de Ven Orig-LKML-Reference: <18888.29986.340328.540512@cargo.ozlabs.ibm.com> Signed-off-by: Ingo Molnar --- diff --git a/Documentation/perf_counter/kerneltop.c b/Documentation/perf_counter/kerneltop.c index ea13e4e67229..7ebde7a336c6 100644 --- a/Documentation/perf_counter/kerneltop.c +++ b/Documentation/perf_counter/kerneltop.c @@ -1157,10 +1157,10 @@ static void mmap_read(struct mmap_data *md) int main(int argc, char *argv[]) { - struct pollfd event_array[MAX_NR_CPUS][MAX_COUNTERS]; + struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS]; struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS]; struct perf_counter_hw_event hw_event; - int i, counter, group_fd; + int i, counter, group_fd, nr_poll = 0; unsigned int cpu; int ret; @@ -1214,8 +1214,9 @@ int main(int argc, char *argv[]) if (group && group_fd == -1) group_fd = fd[i][counter]; - event_array[i][counter].fd = fd[i][counter]; - event_array[i][counter].events = POLLIN; + event_array[nr_poll].fd = fd[i][counter]; + event_array[nr_poll].events = POLLIN; + nr_poll++; mmap_array[i][counter].counter = counter; mmap_array[i][counter].prev = 0; @@ -1247,7 +1248,7 @@ int main(int argc, char *argv[]) } if (hits == events) - ret = poll(event_array[0], nr_cpus, 1000); + ret = poll(event_array, nr_poll, 1000); hits = events; }