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mm/damon: add a tracepoint 

This commit adds a tracepoint for DAMON.  It traces the monitoring results
of each region for each aggregation interval.  Using this, DAMON can
easily integrated with tracepoints supporting tools such as perf.

Link: https://lkml.kernel.org/r/20210716081449.22187-7-sj38.park@gmail.com
Signed-off-by: SeongJae Park <sjpark@amazon.de>
Reviewed-by: Leonard Foerster <foersleo@amazon.de>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Fernand Sieber <sieberf@amazon.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Amit Shah <amit@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: David Woodhouse <dwmw@amazon.com>
Cc: Fan Du <fan.du@intel.com>
Cc: Greg Kroah-Hartman <greg@kroah.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Marco Elver <elver@google.com>
Cc: Markus Boehme <markubo@amazon.de>
Cc: Maximilian Heyne <mheyne@amazon.de>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
SeongJae Park 2021-09-07 19:56:48 -07:00 committed by Linus Torvalds
parent 3f49584b26
commit 2fcb93629a
2 changed files with 49 additions and 1 deletions
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43
include/trace/events/damon.h Normal file
View File

@ -0,0 +1,43 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM damon
#if !defined(_TRACE_DAMON_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_DAMON_H
#include <linux/damon.h>
#include <linux/types.h>
#include <linux/tracepoint.h>
TRACE_EVENT(damon_aggregated,
TP_PROTO(struct damon_target *t, struct damon_region *r,
unsigned int nr_regions),
TP_ARGS(t, r, nr_regions),
TP_STRUCT__entry(
__field(unsigned long, target_id)
__field(unsigned int, nr_regions)
__field(unsigned long, start)
__field(unsigned long, end)
__field(unsigned int, nr_accesses)
),
TP_fast_assign(
__entry->target_id = t->id;
__entry->nr_regions = nr_regions;
__entry->start = r->ar.start;
__entry->end = r->ar.end;
__entry->nr_accesses = r->nr_accesses;
),
TP_printk("target_id=%lu nr_regions=%u %lu-%lu: %u",
__entry->target_id, __entry->nr_regions,
__entry->start, __entry->end, __entry->nr_accesses)
);
#endif /* _TRACE_DAMON_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

7
mm/damon/core.c
View File

@ -13,6 +13,9 @@
#include <linux/random.h>
#include <linux/slab.h>
#define CREATE_TRACE_POINTS
#include <trace/events/damon.h>
/* Get a random number in [l, r) */
#define damon_rand(l, r) (l + prandom_u32_max(r - l))
@ -387,8 +390,10 @@ static void kdamond_reset_aggregated(struct damon_ctx *c)
damon_for_each_target(t, c) {
struct damon_region *r;
damon_for_each_region(r, t)
damon_for_each_region(r, t) {
trace_damon_aggregated(t, r, damon_nr_regions(t));
r->nr_accesses = 0;
}
}
}