linux-kernel - Re: Re: [PATCH v2 1/9] mm: Introduce Data Access MONitor (DAMON)

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Message-ID: <20200128160915.25653-1-sjpark@amazon.com>
Date:   Tue, 28 Jan 2020 17:09:15 +0100
From:   <sjpark@...zon.com>
To:     Randy Dunlap <rdunlap@...radead.org>
CC:     <sjpark@...zon.com>, <akpm@...ux-foundation.org>,
        SeongJae Park <sjpark@...zon.de>, <sj38.park@...il.com>,
        <acme@...nel.org>, <amit@...nel.org>, <brendan.d.gregg@...il.com>,
        <corbet@....net>, <dwmw@...zon.com>, <mgorman@...e.de>,
        <rostedt@...dmis.org>, <kirill@...temov.name>,
        <brendanhiggins@...gle.com>, <colin.king@...onical.com>,
        <minchan@...nel.org>, <vdavydov.dev@...il.com>,
        <vdavydov@...allels.com>, <linux-mm@...ck.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH v2 1/9] mm: Introduce Data Access MONitor (DAMON)

On Tue, 28 Jan 2020 08:06:38 -0800 Randy Dunlap <rdunlap@...radead.org> wrote:

> On 1/28/20 12:57 AM, sjpark@...zon.com wrote:
> > diff --git a/mm/Kconfig b/mm/Kconfig
> > index ab80933be65f..144fb916aa8b 100644
> > --- a/mm/Kconfig
> > +++ b/mm/Kconfig
> > @@ -739,4 +739,16 @@ config ARCH_HAS_HUGEPD
> >  config MAPPING_DIRTY_HELPERS
> >          bool
> >  
> > +config DAMON
> > +	tristate "Data Access Monitor"
> > +	depends on MMU
> > +	default y
> 
> Might be lightweight but still should not default to 'y'.

Good point, will default to 'n' in next spin.


Thanks,
SeongJae Park

> 
> > +	help
> > +	  Provides data access monitoring.
> > +
> > +	  DAMON is a kernel module that allows users to monitor the actual
> > +	  memory access pattern of specific user-space processes.  It aims to
> > +	  be 1) accurate enough to be useful for performance-centric domains,
> > +	  and 2) sufficiently light-weight so that it can be applied online.
> > +
> >  endmenu
> 
> thanks.
> -- 
> ~Randy
>