summaryrefslogtreecommitdiff
path: root/tools/perf/util/pstack.c
diff options
context:
space:
mode:
authorArnaldo Carvalho de Melo <acme@redhat.com>2010-05-15 03:05:21 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-05-15 03:05:21 +0400
commit3e1bbdc3a721f4b1ed44f4554402a8dbc60fa97f (patch)
tree36dce578a3f530c72e30051ded963759dc40a716 /tools/perf/util/pstack.c
parentc82ee828aa20487d254a5225d256cd422acee459 (diff)
downloadlinux-3e1bbdc3a721f4b1ed44f4554402a8dbc60fa97f.tar.xz
perf newt: Make <- zoom out filters
After we use the filters to zoom into DSOs or threads, we can use <- (left arrow) to zoom out from the last filter applied. It is still possible to zoom out of order by using the popup menu. With this we now have the zoom out operation on the browsing fast path, by allowing fast navigation using just the four arrors and the enter key to expand collapse callchains. Suggested-by: Ingo Molnar <mingo@elte.hu> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/pstack.c')
-rw-r--r--tools/perf/util/pstack.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/tools/perf/util/pstack.c b/tools/perf/util/pstack.c
new file mode 100644
index 000000000000..13d36faf64eb
--- /dev/null
+++ b/tools/perf/util/pstack.c
@@ -0,0 +1,75 @@
+/*
+ * Simple pointer stack
+ *
+ * (c) 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
+ */
+
+#include "util.h"
+#include "pstack.h"
+#include <linux/kernel.h>
+#include <stdlib.h>
+
+struct pstack {
+ unsigned short top;
+ unsigned short max_nr_entries;
+ void *entries[0];
+};
+
+struct pstack *pstack__new(unsigned short max_nr_entries)
+{
+ struct pstack *self = zalloc((sizeof(*self) +
+ max_nr_entries * sizeof(void *)));
+ if (self != NULL)
+ self->max_nr_entries = max_nr_entries;
+ return self;
+}
+
+void pstack__delete(struct pstack *self)
+{
+ free(self);
+}
+
+bool pstack__empty(const struct pstack *self)
+{
+ return self->top == 0;
+}
+
+void pstack__remove(struct pstack *self, void *key)
+{
+ unsigned short i = self->top, last_index = self->top - 1;
+
+ while (i-- != 0) {
+ if (self->entries[i] == key) {
+ if (i < last_index)
+ memmove(self->entries + i,
+ self->entries + i + 1,
+ (last_index - i) * sizeof(void *));
+ --self->top;
+ return;
+ }
+ }
+ pr_err("%s: %p not on the pstack!\n", __func__, key);
+}
+
+void pstack__push(struct pstack *self, void *key)
+{
+ if (self->top == self->max_nr_entries) {
+ pr_err("%s: top=%d, overflow!\n", __func__, self->top);
+ return;
+ }
+ self->entries[self->top++] = key;
+}
+
+void *pstack__pop(struct pstack *self)
+{
+ void *ret;
+
+ if (self->top == 0) {
+ pr_err("%s: underflow!\n", __func__);
+ return NULL;
+ }
+
+ ret = self->entries[--self->top];
+ self->entries[self->top] = NULL;
+ return ret;
+}