Received-SPF: pass (google.com: domain of linux-kernel+bounces-202619-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
From: David Wang <00107082@163.com>
To: kent.overstreet@linux.dev,
	surenb@google.com,
	keescook@chromium.org
Cc: linux-kernel@vger.kernel.org
Subject: [BUG?] memory allocation profiling: the counters are not non-decreasing.
Date: Wed,  5 Jun 2024 20:37:10 +0800
Message-Id: <20240605123710.7396-1-00107082@163.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Hi,
I was playing with this new feature of memory allocation profiling, when I plot the data, grouped by caller's source dir, 
I noticed that the counters are not non-decreasing.
If I understand this feature correctly, all counters should be non-decreasing, right?
Or is there some TTL for stale items?

Following is a simpler script demonstrating my sayings

	$ for i in {1..100}; do sudo cat /proc/allocinfo | grep " mm\/" | awk '{s+=$2}END{print s}'; sleep 10; done
	1194453
	1196935
	1198957
	1199716
	1200770
	1190795  <--- decrease here
	1192702
	1193070
	1193812
	1195069
	1196491
	...

FYI
David