linux-kernel - [PATCH 1/1] fixup: alloc_tag: mark inaccurate allocation counters in /proc/allocinfo output

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Message-ID: <20250916160110.266190-1-surenb@google.com>
Date: Tue, 16 Sep 2025 09:01:10 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: akpm@...ux-foundation.org
Cc: kent.overstreet@...ux.dev, vbabka@...e.cz, hannes@...xchg.org, 
	usamaarif642@...il.com, rientjes@...gle.com, roman.gushchin@...ux.dev, 
	harry.yoo@...cle.com, shakeel.butt@...ux.dev, 00107082@....com, 
	pyyjason@...il.com, pasha.tatashin@...een.com, souravpanda@...gle.com, 
	surenb@...gle.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] fixup: alloc_tag: mark inaccurate allocation counters in
 /proc/allocinfo output

Document new "accurate:no" marker.

Fixes: 39d117e04d15 ("alloc_tag: mark inaccurate allocation counters in /proc/allocinfo output")
Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
Based on mm-new

 Documentation/filesystems/proc.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 1776a06571c2..17668f82ff1c 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -1014,6 +1014,14 @@ If file version is 2.0 or higher then each line may contain additional
 For example if the counters are not accurate, the line will be appended with
 "accurate:no" pair.
 
+Supported markers in v2:
+accurate:no
+              Absolute values of the counters in this line are not
+              accurate because of the failure to allocate storage required
+              to track some of the allocations made at this location.
+              Deltas in these counters are accurate, therefore counters
+              can be used to track allocation size and count changes.
+
 Example output.
 
 ::

base-commit: 199236646ffd82b5a5bcf2bca1579ea06cb0ae74
-- 
2.51.0.384.g4c02a37b29-goog