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Tue, 12 Sep 2023 18:36:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0063C433CB; Tue, 12 Sep 2023 18:36:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1694543764; bh=yCdyENSSr2jBoqcU5uuhQp9Eg5ZiZzpyIfgAEWQFG08=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s5JuUHrpz8KMHLkg8aMJ3PtViMENNhZOAtLD6nysZlBWl+uyrhv3zSqqpvNWONwQv QIYEUB0E3w2F8W8SuVnlt4LiU46fzpWpTcGR1gDv0470uUcu68m82Tfb5IOmyGa66v Hgdbt+Em7BmjNyVFjcxWVozqsAVTzx7b/rjX+alJW6jVjsuZIgNTXpXgyaW3GKKxeK PMHGe7U7hSnxaxc51DtQj/mkPe9NSLEC3QTWMD00ClWL2m6C6AGJPKSvg3hCYdOnHn jzuAi2lVeOsQD4elxE82Ev28fTLi035QaPSuhabGm/E8Y0dak2rqeJ+VYu3WK1UTlm /p3a8NJIx8bow== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Jonathan Corbet , damon@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] Docs/admin-guide/mm/damon/usage: document damos_before_apply tracepoint Date: Tue, 12 Sep 2023 18:35:59 +0000 Message-Id: <20230912183559.4733-3-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230912183559.4733-1-sj@kernel.org> References: <20230912183559.4733-1-sj@kernel.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: 79E0C1A0019 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: ue4npcsdyexyx9zz8u9iohn6y7ptuegn X-HE-Tag: 1694543765-869848 X-HE-Meta: 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 Y3tL3OzE jPpOQ2sNyw48ZV+WlHYH/7uWK4lwL8Td9idDt2ItpwAHL5CTWuiggcZZh5LDxEcx5oQq+knM9/lKBYnEHP730+clV23PsXmddw15TK6jfKzYnqQeEFQTGbUqeO83jG5bMJsu9nh2bsbqDjyXs0ct2d4nHqPZG9Bwb+KVdlSF9KUmgVRFth4tZ/cGGIcBHky5cVPs7/XsmXeUFNtgU4Ml7nvM+00yqhGhIVdwyrZJfJMBTGVJtA5GgKRVVcbnh6cK+U+A5Z76WBqOzHONqQiQrWRHIR+62P+mBp8DkAlEYoNHlYdH3jEc07/dMEbjjXfKNrbxLlcXEVU5gPuDAE06RZzb0jN4CLTMnCMV4h9/WnYUzl7GalH+CluERx4KnOD3uzuI00M5InYaTlaBApTcx9wrtPVws6pz9RzWo X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Document damos_before_apply tracepoint on the usage document. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 37 ++++++++++++++++---- 1 file changed, 30 insertions(+), 7 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index 282062b6f134..6272cd36590a 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -496,15 +496,24 @@ the files as above. Above is only for an example. .. _tracepoint: -Tracepoint for Monitoring Results -================================= +Tracepoints for Monitoring Results +================================== Users can get the monitoring results via the :ref:`tried_regions -` or a tracepoint, ``damon:damon_aggregated``. -While the tried regions directory is useful for getting a snapshot, the -tracepoint is useful for getting a full record of the results. While the -monitoring is turned on, you could record the tracepoint events and show -results using tracepoint supporting tools like ``perf``. For example:: +`. The interface is useful for getting a +snapshot, but it could be inefficient for fully recording all the monitoring +results. For the purpose, two trace points, namely ``damon:damon_aggregated`` +and ``damon:damos_before_apply``, are provided. ``damon:damon_aggregated`` +provides the whole monitoring results, while ``damon:damos_before_apply`` +provides the monitoring results for regions that each DAMON-based Operation +Scheme (:ref:`DAMOS `) is gonna be applied. Hence, +``damon:damos_before_apply`` is more useful for recording internal behavior of +DAMOS, or DAMOS target access +:ref:`pattern ` based query-like efficient +monitoring results recording. + +While the monitoring is turned on, you could record the tracepoint events and +show results using tracepoint supporting tools like ``perf``. For example:: # echo on > monitor_on # perf record -e damon:damon_aggregated & @@ -527,6 +536,20 @@ counter). Finally the tenth field (``X``) shows the ``age`` of the region (refer to :ref:`design ` for more details of the counter). +If the event was ``damon:damos_beofre_apply``, the ``perf script`` output would +be somewhat like below:: + + kdamond.0 47293 [000] 80801.060214: damon:damos_before_apply: ctx_idx=0 scheme_idx=0 target_idx=0 nr_regions=11 121932607488-135128711168: 0 136 + [...] + +Each line of the output represents each monitoring region that each DAMON-based +Operation Scheme was about to be applied at the traced time. The first five +fields are as usual. It shows the index of the DAMON context (``ctx_idx=X``) +of the scheme in the list of the contexts of the context's kdamond, the index +of the scheme (``scheme_idx=X``) in the list of the schemes of the context, in +addition to the output of ``damon_aggregated`` tracepoint. + + .. _debugfs_interface: debugfs Interface (DEPRECATED!)