From: Leonard Foerster <foersleo@amazon.com>
To: SeongJae Park <sjpark@amazon.com>
Cc: akpm@linux-foundation.org, 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,
foersleo@amazon.de, irogers@google.com, jolsa@redhat.com,
kirill@shutemov.name, mark.rutland@arm.com, mgorman@suse.de,
minchan@kernel.org, mingo@redhat.com, namhyung@kernel.org,
peterz@infradead.org, rdunlap@infradead.org, riel@surriel.com,
rientjes@google.com, rostedt@goodmis.org, sblbir@amazon.com,
shakeelb@google.com, shuah@kernel.org, sj38.park@gmail.com,
snu@amazon.de, vbabka@suse.cz, vdavydov.dev@gmail.com,
yang.shi@linux.alibaba.com, ying.huang@intel.com,
linux-damon@amazon.com, linux-mm@kvack.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v14 04/15] mm/damon: Adaptively adjust regions
Date: Wed, 3 Jun 2020 10:21:58 +0200 [thread overview]
Message-ID: <1591172518-25575-1-git-send-email-foersleo@amazon.com> (raw)
In-Reply-To: <20200602130125.20467-5-sjpark@amazon.com>
On 2020-06-02T15:01:14+02:00 SeongJae Park <sjpark@amazon.com> wrote:
> From: SeongJae Park <sjpark@amazon.de>
>
> At the beginning of the monitoring, DAMON constructs the initial regions
> by evenly splitting the memory mapped address space of the process into
> the user-specified minimal number of regions. In this initial state,
> the assumption of the regions (pages in same region have similar access
> frequencies) is normally not kept and thus the monitoring quality could
> be low. To keep the assumption as much as possible, DAMON adaptively
> merges and splits each region.
>
> For each ``aggregation interval``, it compares the access frequencies of
> adjacent regions and merges those if the frequency difference is small.
> Then, after it reports and clears the aggregated access frequency of
> each region, it splits each region into two regions if the total number
> of regions is smaller than the half of the user-specified maximum number
> of regions.
>
> In this way, DAMON provides its best-effort quality and minimal overhead
> while keeping the bounds users set for their trade-off.
>
> Signed-off-by: SeongJae Park <sjpark@amazon.de>
Reviewed-by: Leonard Foerster <foersleo@amazon.de>
next prev parent reply other threads:[~2020-06-03 8:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-02 13:01 [PATCH v14 00/15] Introduce Data Access MONitor (DAMON) SeongJae Park
2020-06-02 13:01 ` [PATCH v14 01/15] mm/page_ext: Export lookup_page_ext() to GPL modules SeongJae Park
2020-06-02 13:01 ` [PATCH v14 02/15] mm: Introduce Data Access MONitor (DAMON) SeongJae Park
2020-06-02 13:01 ` [PATCH v14 03/15] mm/damon: Implement region based sampling SeongJae Park
2020-06-02 13:01 ` [PATCH v14 04/15] mm/damon: Adaptively adjust regions SeongJae Park
2020-06-03 8:21 ` Leonard Foerster [this message]
2020-06-02 13:01 ` [PATCH v14 05/15] mm/damon: Apply dynamic memory mapping changes SeongJae Park
2020-06-02 13:01 ` [PATCH v14 06/15] mm/damon: Implement callbacks SeongJae Park
2020-06-02 13:01 ` [PATCH v14 07/15] mm/damon: Implement access pattern recording SeongJae Park
2020-06-02 13:01 ` [PATCH v14 08/15] mm/damon: Add debugfs interface SeongJae Park
2020-06-02 13:12 ` [PATCH v14 09/15] mm/damon: Add tracepoints SeongJae Park
2020-06-02 15:35 ` Steven Rostedt
2020-06-02 15:42 ` SeongJae Park
2020-06-02 13:13 ` [PATCH v14 10/15] tools: Add a minimal user-space tool for DAMON SeongJae Park
2020-06-02 13:14 ` [PATCH v14 11/15] Documentation/admin-guide/mm: Add a document " SeongJae Park
2020-06-02 13:15 ` [PATCH v14 12/15] mm/damon: Add kunit tests SeongJae Park
2020-06-02 13:15 ` [PATCH v14 13/15] mm/damon-test: Add a kunit test for recording setup SeongJae Park
2020-06-02 20:28 ` Brendan Higgins
2020-06-03 12:42 ` SeongJae Park
2020-06-03 21:07 ` Brendan Higgins
2020-06-02 13:16 ` [PATCH v14 14/15] mm/damon: Add user space selftests SeongJae Park
2020-06-02 13:17 ` [PATCH v14 15/15] MAINTAINERS: Update for DAMON SeongJae Park
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