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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>, <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 v8 08/10] tools/damon/record: Support physical memory monitoring
Date: Mon, 31 Aug 2020 12:47:28 +0200	[thread overview]
Message-ID: <20200831104730.28970-9-sjpark@amazon.com> (raw)
In-Reply-To: <20200831104730.28970-1-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



  parent reply	other threads:[~2020-08-31 10:50 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-31 10:47 [RFC v8 00/10] DAMON: Support Physical Memory Address Space Monitoring SeongJae Park
2020-08-31 10:47 ` [RFC v8 01/10] mm/damon/debugfs: Allow users to set initial monitoring target regions SeongJae Park
2020-08-31 18:08   ` Marco Elver
2020-09-01  6:35     ` SeongJae Park
2020-08-31 10:47 ` [RFC v8 02/10] tools/damon: Support init target regions specification SeongJae Park
2020-08-31 10:47 ` [RFC v8 03/10] mm/damon-test: Add more unit tests for 'init_regions' SeongJae Park
2020-08-31 10:47 ` [RFC v8 04/10] selftests/damon/_chk_record: Do not check number of gaps SeongJae Park
2020-08-31 10:47 ` [RFC v8 05/10] Docs/admin-guide/mm/damon: Document 'init_regions' feature SeongJae Park
2020-08-31 10:47 ` [RFC v8 06/10] mm/damon: Implement callbacks for physical memory monitoring SeongJae Park
2020-08-31 10:47 ` [RFC v8 07/10] mm/damon/debugfs: Support " SeongJae Park
2020-08-31 10:47 ` SeongJae Park [this message]
2020-08-31 10:47 ` [RFC v8 09/10] tools/damon/record: Support NUMA specific recording SeongJae Park
2020-08-31 10:47 ` [RFC v8 10/10] Docs/DAMON: Document physical memory monitoring support SeongJae Park
2020-09-01  6:37 ` [RFC v8 00/10] DAMON: Support Physical Memory Address Space Monitoring SeongJae Park

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