linux-kernel - [PATCH 2/2] Docs/admin-guide/mm/damon/usage: Fix wrong usage example of init

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Message-Id: <20221024174619.15600-3-sj@kernel.org>
Date:   Mon, 24 Oct 2022 17:46:19 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jonathan Corbet <corbet@....net>, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: [PATCH 2/2] Docs/admin-guide/mm/damon/usage: Fix wrong usage example of init_regions file

DAMON debugfs interface assumes the users will write all inputs at once.
However, redirecting a string of multiple lines sometimes end up writing
line by line.  Therefore, the example usage of 'init_regions' file,
which writes input as a string of multiple lines can fail.  Fix it to
use a single line string instead.  Also update the description of the
usage to not assume users will write inputs in multiple lines.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 Documentation/admin-guide/mm/damon/usage.rst | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index 89d9a4f75a29..c17e02e1e426 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -468,8 +468,9 @@ regions in case of physical memory monitoring.  Therefore, users should set the
 monitoring target regions by themselves.
 
 In such cases, users can explicitly set the initial monitoring target regions
-as they want, by writing proper values to the ``init_regions`` file.  Each line
-of the input should represent one region in below form.::
+as they want, by writing proper values to the ``init_regions`` file.  The input
+should be a sequence of three integers separated by white spaces that represent
+one region in below form.::
 
     <target idx> <start address> <end address>
 
@@ -484,9 +485,9 @@ ranges, ``20-40`` and ``50-100`` as that of pid 4242, which is the second one
     # cd <debugfs>/damon
     # cat target_ids
     42 4242
-    # echo "0   1       100
-            0   100     200
-            1   20      40
+    # echo "0   1       100 \
+            0   100     200 \
+            1   20      40  \
             1   50      100" > init_regions
 
 Note that this sets the initial monitoring target regions only.  In case of
-- 
2.25.1