perf tools: Remove expensive old debug code from perf top

Calling gettimeofday() at high frequency is painful for handicapped
boxen. The spot calling gettimeofday() is old unneeded debug code,
so remove it.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1255438640.7173.1.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index c0f69e80b2cca4de01410c786b627e2cf082ae28..2d8806bac25821654482798a599795d528a08a26 100644 (file)
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -870,8 +870,6 @@ static unsigned int mmap_read_head(struct mmap_data *md)
        return head;
 }
 
-struct timeval last_read, this_read;
-
 static void mmap_read_counter(struct mmap_data *md)
 {
        unsigned int head = mmap_read_head(md);
@@ -879,8 +877,6 @@ static void mmap_read_counter(struct mmap_data *md)
        unsigned char *data = md->base + page_size;
        int diff;
 
-       gettimeofday(&this_read, NULL);
-
        /*
         * If we're further behind than half the buffer, there's a chance
         * the writer will bite our tail and mess up the samples under us.
@@ -891,14 +887,7 @@ static void mmap_read_counter(struct mmap_data *md)
         */
        diff = head - old;
        if (diff > md->mask / 2 || diff < 0) {
-               struct timeval iv;
-               unsigned long msecs;
-
-               timersub(&this_read, &last_read, &iv);
-               msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
-
-               fprintf(stderr, "WARNING: failed to keep up with mmap data."
-                               "  Last read %lu msecs ago.\n", msecs);
+               fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
 
                /*
                 * head points to a known good entry, start there.
@@ -906,8 +895,6 @@ static void mmap_read_counter(struct mmap_data *md)
                old = head;
        }
 
-       last_read = this_read;
-
        for (; old != head;) {
                event_t *event = (event_t *)&data[old & md->mask];