linux-kernel - Re: [PATCH v22 04/18] mm/damon: Track dynamic monitoring target regions update

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Message-ID: <CALvZod6iLkNyePTMn9=DOgbD5Q7Yqc_WrQrNqOQ3e-2+FtJZsg@mail.gmail.com>
Date:   Wed, 25 Nov 2020 07:29:57 -0800
From:   Shakeel Butt <shakeelb@...gle.com>
To:     SeongJae Park <sjpark@...zon.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        SeongJae Park <sjpark@...zon.de>, Jonathan.Cameron@...wei.com,
        Andrea Arcangeli <aarcange@...hat.com>, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, amit@...nel.org,
        benh@...nel.crashing.org, brendan.d.gregg@...il.com,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Qian Cai <cai@....pw>,
        Colin Ian King <colin.king@...onical.com>,
        Jonathan Corbet <corbet@....net>,
        David Hildenbrand <david@...hat.com>, dwmw@...zon.com,
        Marco Elver <elver@...gle.com>, "Du, Fan" <fan.du@...el.com>,
        foersleo@...zon.de, Greg Thelen <gthelen@...gle.com>,
        Ian Rogers <irogers@...gle.com>, jolsa@...hat.com,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Mark Rutland <mark.rutland@....com>,
        Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, namhyung@...nel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Rik van Riel <riel@...riel.com>,
        David Rientjes <rientjes@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mike Rapoport <rppt@...nel.org>, sblbir@...zon.com,
        Shuah Khan <shuah@...nel.org>, sj38.park@...il.com,
        snu@...zon.de, Vlastimil Babka <vbabka@...e.cz>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Huang Ying <ying.huang@...el.com>, zgf574564920@...il.com,
        linux-damon@...zon.com, Linux MM <linux-mm@...ck.org>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v22 04/18] mm/damon: Track dynamic monitoring target
 regions update

On Tue, Oct 20, 2020 at 2:02 AM SeongJae Park <sjpark@...zon.com> wrote:
>
> From: SeongJae Park <sjpark@...zon.de>
>
> The monitoring target address range can be dynamically changed.  For
> example, virtual memory could be dynamically mapped and unmapped.
> Physical memory could be hot-plugged.
>
> As the changes could be quite frequent in some cases,

Which cases? Usually address space changes are very infrequent for
performance reasons.

> DAMON checks the
> dynamic memory mapping changes and applies it to the abstracted target
> area only for each of a user-specified time interval, ``regions update
> interval``.
>
> Signed-off-by: SeongJae Park <sjpark@...zon.de>
> Reviewed-by: Leonard Foerster <foersleo@...zon.de>
[snip]
>   * Check whether current monitoring should be stopped
>   *
> @@ -612,6 +625,11 @@ static int kdamond_fn(void *data)
>                         kdamond_reset_aggregated(ctx);
>                         kdamond_split_regions(ctx);
>                 }
> +
> +               if (kdamond_need_update_regions(ctx)) {
> +                       kdamond_call_prmt(ctx, update_target_regions);

The implementation of update_target_regions callback should be part of
this patch.


> +                       sz_limit = damon_region_sz_limit(ctx);
> +               }
>         }
>         damon_for_each_target(t, ctx) {
>                 damon_for_each_region_safe(r, next, t)
> --
> 2.17.1
>