[RFC v9 08/10] tools/damon/record: Support physical memory monitoring
From: SeongJae Park <hidden>
Date: 2020-10-07 07:17:35
Also in:
linux-mm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: SeongJae Park <redacted> 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 <redacted> --- 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