From: SeongJae Park <sjpark@amazon.com>
To: <akpm@linux-foundation.org>
Cc: SeongJae Park <sjpark@amazon.de>, <Jonathan.Cameron@Huawei.com>,
<aarcange@redhat.com>, <acme@kernel.org>,
<alexander.shishkin@linux.intel.com>, <amit@kernel.org>,
<benh@kernel.crashing.org>, <brendan.d.gregg@gmail.com>,
<brendanhiggins@google.com>, <cai@lca.pw>,
<colin.king@canonical.com>, <corbet@lwn.net>, <david@redhat.com>,
<dwmw@amazon.com>, <elver@google.com>, <fan.du@intel.com>,
<foersleo@amazon.de>, <gthelen@google.com>, <irogers@google.com>,
<jolsa@redhat.com>, <kirill@shutemov.name>,
<mark.rutland@arm.com>, <mgorman@suse.de>, <minchan@kernel.org>,
<mingo@redhat.com>, <namhyung@kernel.org>, <peterz@infradead.org>,
<rdunlap@infradead.org>, <riel@surriel.com>,
<rientjes@google.com>, <rostedt@goodmis.org>, <rppt@kernel.org>,
<sblbir@amazon.com>, <shakeelb@google.com>, <shuah@kernel.org>,
<sj38.park@gmail.com>, <snu@amazon.de>, <vbabka@suse.cz>,
<vdavydov.dev@gmail.com>, <yang.shi@linux.alibaba.com>,
<ying.huang@intel.com>, <zgf574564920@gmail.com>,
<linux-damon@amazon.com>, <linux-mm@kvack.org>,
<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [RFC v9 08/10] tools/damon/record: Support physical memory monitoring
Date: Wed, 7 Oct 2020 09:14:07 +0200 [thread overview]
Message-ID: <20201007071409.12174-9-sjpark@amazon.com> (raw)
In-Reply-To: <20201007071409.12174-1-sjpark@amazon.com>
From: SeongJae Park <sjpark@amazon.de>
This commit allows users to record the data accesses on physical memory
address space by passing 'paddr' as target to 'damo-record'. If the
init regions are given, the regions will be monitored. Else, it will
monitor biggest conitguous 'System RAM' region in '/proc/iomem' and
monitor the region.
Signed-off-by: SeongJae Park <sjpark@amazon.de>
---
tools/damon/_damon.py | 2 ++
tools/damon/record.py | 29 ++++++++++++++++++++++++++++-
2 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/tools/damon/_damon.py b/tools/damon/_damon.py
index a22ec3777c16..6ff278117e84 100644
--- a/tools/damon/_damon.py
+++ b/tools/damon/_damon.py
@@ -27,6 +27,8 @@ def set_target(tid, init_regions=[]):
if not os.path.exists(debugfs_init_regions):
return 0
+ if tid == 'paddr':
+ tid = 42
string = ' '.join(['%s %d %d' % (tid, r[0], r[1]) for r in init_regions])
return subprocess.call('echo "%s" > %s' % (string, debugfs_init_regions),
shell=True, executable='/bin/bash')
diff --git a/tools/damon/record.py b/tools/damon/record.py
index 11fd54001472..6fd0b59c73e0 100644
--- a/tools/damon/record.py
+++ b/tools/damon/record.py
@@ -101,6 +101,29 @@ def set_argparser(parser):
parser.add_argument('-o', '--out', metavar='<file path>', type=str,
default='damon.data', help='output file path')
+def default_paddr_region():
+ "Largest System RAM region becomes the default"
+ ret = []
+ with open('/proc/iomem', 'r') as f:
+ # example of the line: '100000000-42b201fff : System RAM'
+ for line in f:
+ fields = line.split(':')
+ if len(fields) != 2:
+ continue
+ name = fields[1].strip()
+ if name != 'System RAM':
+ continue
+ addrs = fields[0].split('-')
+ if len(addrs) != 2:
+ continue
+ start = int(addrs[0], 16)
+ end = int(addrs[1], 16)
+
+ sz_region = end - start
+ if not ret or sz_region > (ret[1] - ret[0]):
+ ret = [start, end]
+ return ret
+
def main(args=None):
global orig_attrs
if not args:
@@ -122,7 +145,11 @@ def main(args=None):
target = args.target
target_fields = target.split()
- if not subprocess.call('which %s &> /dev/null' % target_fields[0],
+ if target == 'paddr': # physical memory address space
+ if not init_regions:
+ init_regions = [default_paddr_region()]
+ do_record(target, False, init_regions, new_attrs, orig_attrs, pidfd)
+ elif not subprocess.call('which %s &> /dev/null' % target_fields[0],
shell=True, executable='/bin/bash'):
do_record(target, True, init_regions, new_attrs, orig_attrs, pidfd)
else:
--
2.17.1
next prev parent reply other threads:[~2020-10-07 7:24 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 7:13 [RFC v9 00/10] DAMON: Support Physical Memory Address Space Monitoring SeongJae Park
2020-10-07 7:14 ` [RFC v9 01/10] damon/dbgfs: Allow users to set initial monitoring target regions SeongJae Park
2020-10-07 7:14 ` [RFC v9 02/10] tools/damon: Support init target regions specification SeongJae Park
2020-10-07 7:14 ` [RFC v9 03/10] damon/dbgfs-test: Add a unit test case for 'init_regions' SeongJae Park
2020-10-07 7:14 ` [RFC v9 04/10] selftests/damon/_chk_record: Do not check number of gaps SeongJae Park
2020-10-07 7:14 ` [RFC v9 05/10] Docs/admin-guide/mm/damon: Document 'init_regions' feature SeongJae Park
2020-10-07 7:14 ` [RFC v9 06/10] damon/primitives: Implement callbacks for physical address space monitoring SeongJae Park
2020-10-07 7:14 ` [RFC v9 07/10] damon/dbgfs: Support physical memory monitoring SeongJae Park
2020-10-07 7:14 ` SeongJae Park [this message]
2020-10-07 7:14 ` [RFC v9 09/10] tools/damon/record: Support NUMA specific recording SeongJae Park
2020-10-07 7:14 ` [RFC v9 10/10] Docs/DAMON: Document physical memory monitoring support SeongJae Park
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