perf tools: Flush ordered events in case of allocation failure
In previous patches we added a limit for ordered events queue allocation
size. If we reach this size we need to flush (part of) the queue to get
some free buffers.
The current functionality is not affected, because the limit is hard
coded to (u64) -1. The configuration code for size will come in
following patches.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-ggcas0xdq847fi85bz73do2e@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 258a527..7cccead 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -732,7 +732,7 @@
return -1;
}
- err = perf_session_queue_event(kvm->session, event, &sample, 0);
+ err = perf_session_queue_event(kvm->session, event, &kvm->tool, &sample, 0);
/*
* FIXME: Here we can't consume the event, as perf_session_queue_event will
* point to it, and it'll get possibly overwritten by the kernel.
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 8d4538c..bd2483b 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -14,6 +14,7 @@
#include "util.h"
#include "cpumap.h"
#include "perf_regs.h"
+#include "asm/bug.h"
static int perf_session__open(struct perf_session *session)
{
@@ -456,6 +457,7 @@
enum oe_flush {
OE_FLUSH__FINAL,
OE_FLUSH__ROUND,
+ OE_FLUSH__HALF,
};
static void perf_session_free_sample_buffers(struct perf_session *session)
@@ -637,6 +639,23 @@
oe->next_flush = ULLONG_MAX;
break;
+ case OE_FLUSH__HALF:
+ {
+ struct ordered_event *first, *last;
+ struct list_head *head = &oe->events;
+
+ first = list_entry(head->next, struct ordered_event, list);
+ last = oe->last;
+
+ /* Warn if we are called before any event got allocated. */
+ if (WARN_ONCE(!last || list_empty(head), "empty queue"))
+ return 0;
+
+ oe->next_flush = first->timestamp;
+ oe->next_flush += (last->timestamp - first->timestamp) / 2;
+ break;
+ }
+
case OE_FLUSH__ROUND:
default:
break;
@@ -699,7 +718,8 @@
}
int perf_session_queue_event(struct perf_session *s, union perf_event *event,
- struct perf_sample *sample, u64 file_offset)
+ struct perf_tool *tool, struct perf_sample *sample,
+ u64 file_offset)
{
struct ordered_events *oe = &s->ordered_events;
u64 timestamp = sample->time;
@@ -714,6 +734,11 @@
}
new = ordered_events__new(oe, timestamp);
+ if (!new) {
+ ordered_events__flush(s, tool, OE_FLUSH__HALF);
+ new = ordered_events__new(oe, timestamp);
+ }
+
if (!new)
return -ENOMEM;
@@ -1121,7 +1146,7 @@
return ret;
if (tool->ordered_events) {
- ret = perf_session_queue_event(session, event, &sample,
+ ret = perf_session_queue_event(session, event, tool, &sample,
file_offset);
if (ret != -ETIME)
return ret;
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index e2fbaf2..a09e3c8 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -67,7 +67,8 @@
struct perf_tool *tool);
int perf_session_queue_event(struct perf_session *s, union perf_event *event,
- struct perf_sample *sample, u64 file_offset);
+ struct perf_tool *tool, struct perf_sample *sample,
+ u64 file_offset);
void perf_tool__fill_defaults(struct perf_tool *tool);