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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>, <dwmw@amazon.com>,
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	<kirill@shutemov.name>, <mark.rutland@arm.com>, <mgorman@suse.de>,
	<minchan@kernel.org>, <mingo@redhat.com>, <namhyung@kernel.org>,
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	<sj38.park@gmail.com>, <snu@amazon.de>, <vbabka@suse.cz>,
	<vdavydov.dev@gmail.com>, <yang.shi@linux.alibaba.com>,
	<ying.huang@intel.com>, <david@redhat.com>,
	<linux-damon@amazon.com>, <linux-mm@kvack.org>,
	<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [RFC v3 05/10] Docs/damon: Document 'initial_regions' feature
Date: Tue, 9 Jun 2020 16:19:36 +0200	[thread overview]
Message-ID: <20200609141941.19184-6-sjpark@amazon.com> (raw)
In-Reply-To: <20200609141941.19184-1-sjpark@amazon.com>

From: SeongJae Park <sjpark@amazon.de>

This commit documents the 'initial_regions' feature.

Signed-off-by: SeongJae Park <sjpark@amazon.de>
---
 Documentation/admin-guide/mm/damon/usage.rst | 34 ++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index 18a19c35b4f3..f600366cdd4e 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -326,6 +326,40 @@ having pids 42 and 4242 as the processes to be monitored and check it again::
 Note that setting the pids doesn't start the monitoring.
 
 
+Initial Monitoring Target Regions
+---------------------------------
+
+DAMON automatically sets and updates the monitoring target regions so that
+entire memory mappings of target processes can be covered.  However, users
+might want to limit the monitoring region to specific address ranges, such as
+the heap, the stack, or specific file-mapped area.  Or, some users might know
+the initial access pattern of their workloads and therefore want to set optimal
+initial regions for the 'adaptive regions adjustment'.
+
+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.::
+
+    <pid> <start address> <end address>
+
+The ``pid`` should be already in ``pids`` file, and the regions should be
+passed in address order.  For example, below commands will set a couple of
+address ranges, ``1-100`` and ``100-200`` as the initial monitoring target
+region of process 42, and another couple of address ranges, ``20-40`` and
+``50-100`` as that of process 4242.::
+
+    # cd <debugfs>/damon
+    # echo "42   1       100
+            42   100     200
+            4242 20      40
+            4242 50      100" > init_regions
+
+Note that this sets the initial monitoring target regions only.  DAMON will
+automatically updates the boundary of the regions after one ``regions update
+interval``.  Therefore, users should set the ``regions update interval`` large
+enough.
+
+
 Record
 ------
 
-- 
2.17.1



  parent reply	other threads:[~2020-06-09 14:22 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-09 14:19 [RFC v3 00/10] DAMON: Support Access Monitoring of Any Address Space Including Physical Memory SeongJae Park
2020-06-09 14:19 ` [RFC v3 01/10] mm/damon: Use vm-independent address range concept SeongJae Park
2020-06-09 14:19 ` [RFC v3 02/10] mm/damon: Make monitoring target regions init/update configurable SeongJae Park
2020-06-09 14:19 ` [RFC v3 03/10] mm/damon/debugfs: Allow users to set initial monitoring target regions SeongJae Park
2020-06-09 14:19 ` [RFC v3 04/10] tools/damon: Implement init target regions feature SeongJae Park
2020-06-09 14:19 ` SeongJae Park [this message]
2020-06-09 14:19 ` [RFC v3 06/10] mm/damon: Make access check primitive configurable SeongJae Park
2020-06-09 14:19 ` [RFC v3 07/10] mm/damon: Implement callbacks for physical memory monitoring SeongJae Park
2020-06-09 14:19 ` [RFC v3 08/10] mm/damon/debugfs: Support " SeongJae Park
2020-06-09 14:19 ` [RFC v3 09/10] tools/damon/record: Support physical memory address spce SeongJae Park
2020-06-09 14:19 ` [RFC v3 10/10] Docs/damon: Document physical memory monitoring support SeongJae Park

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