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From: SeongJae Park <sjpark@amazon.com>
To: Mike Rapoport <rppt@kernel.org>
Cc: SeongJae Park <sjpark@amazon.com>, <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>, <david@redhat.com>,
	<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: Re: Re: [PATCH v18 01/14] mm/page_ext: Export lookup_page_ext() to GPL modules
Date: Mon, 13 Jul 2020 19:38:05 +0200
Message-ID: <20200713173805.31923-1-sjpark@amazon.com> (raw)
In-Reply-To: <20200713171909.GD707159@kernel.org> (raw)

On Mon, 13 Jul 2020 20:19:09 +0300 Mike Rapoport <rppt@kernel.org> wrote:

> On Mon, Jul 13, 2020 at 02:21:43PM +0200, SeongJae Park wrote:
> > On Mon, 13 Jul 2020 15:08:42 +0300 Mike Rapoport <rppt@kernel.org> wrote:
> > 
> > > Hi,
> > > 
> > > On Mon, Jul 13, 2020 at 10:41:31AM +0200, SeongJae Park wrote:
> > > > From: SeongJae Park <sjpark@amazon.de>
> > > > 
> > > > This commit exports 'lookup_page_ext()' to GPL modules.  It will be used
> > > > by DAMON in following commit for the implementation of the region based
> > > > sampling.
> > > 
> > > Maybe I'm missing something, but why is DAMON a module?
> > 
> > I made it loadable just for easier adoption from downstream kernels.  I could
> > drop the module build support if asked.
>  
> Well, exporting core mm symbols to modules should be considred very
> carefully. 

Agreed.  I will drop the module support from the next spin.

> 
> Why lookup_page_ext() is required for DAMON? It is not used anywhere in
> this patchset.

It's indirectly used.  In the 6th patch, DAMON uses 'set_page_young()' to not
interfere with other PTE Accessed bit users.  And, 'set_page_young()' uses
'lookup_page_ext()' if !CONFIG_64BIT.  That's why I exported it.


Thanks,
SeongJae Park

  reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-13  8:41 [PATCH v18 00/14] Introduce Data Access MONitor (DAMON) SeongJae Park
2020-07-13  8:41 ` [PATCH v18 01/14] mm/page_ext: Export lookup_page_ext() to GPL modules SeongJae Park
2020-07-13 12:08   ` Mike Rapoport
2020-07-13 12:21     ` SeongJae Park
2020-07-13 17:19       ` Mike Rapoport
2020-07-13 17:38         ` SeongJae Park [this message]
2020-07-17  9:59           ` Re: " SeongJae Park
2020-07-13  8:41 ` [PATCH v18 02/14] mm: Introduce Data Access MONitor (DAMON) SeongJae Park
2020-07-18  2:47   ` Shakeel Butt
2020-07-18 13:31     ` SeongJae Park
2020-07-29 15:31       ` Shakeel Butt
2020-07-29 17:29         ` SeongJae Park
2020-07-13  8:41 ` [PATCH v18 03/14] mm/damon: Implement region based sampling SeongJae Park
2020-07-13  8:41 ` [PATCH v18 04/14] mm/damon: Adaptively adjust regions SeongJae Park
2020-07-13  8:41 ` [PATCH v18 05/14] mm/damon: Track dynamic monitoring target regions update SeongJae Park
2020-07-13  8:41 ` [PATCH v18 06/14] mm/damon: Implement callbacks for the virtual memory address spaces SeongJae Park
2020-07-17  0:46   ` Shakeel Butt
2020-07-17  6:53     ` SeongJae Park
2020-07-17 15:17       ` Shakeel Butt
2020-07-17 16:24         ` SeongJae Park
2020-07-18  2:23           ` Shakeel Butt
2020-07-18  2:51             ` SeongJae Park
2020-07-27  7:34   ` Greg Thelen
2020-07-27  9:02     ` SeongJae Park
2020-07-28 17:42       ` Shakeel Butt
2020-07-29  6:20         ` SeongJae Park
2020-07-13  8:41 ` [PATCH v18 07/14] mm/damon: Implement access pattern recording SeongJae Park
2020-07-13  8:41 ` [PATCH v18 08/14] mm/damon: Add a tracepoint SeongJae Park
2020-07-13  8:41 ` [PATCH v18 09/14] mm/damon: Implement a debugfs interface SeongJae Park
2020-07-22 10:36   ` SeongJae Park
2020-07-13  8:41 ` [PATCH v18 10/14] tools: Introduce a minimal user-space tool for DAMON SeongJae Park
2020-07-13  8:41 ` [PATCH v18 11/14] Documentation: Add documents " SeongJae Park
2020-07-27  7:19   ` Greg Thelen
2020-07-27  7:38     ` SeongJae Park
2020-07-13  8:41 ` [PATCH v18 12/14] mm/damon: Add kunit tests SeongJae Park
2020-07-13  8:41 ` [PATCH v18 13/14] mm/damon: Add user space selftests SeongJae Park
2020-07-13  8:41 ` [PATCH v18 14/14] MAINTAINERS: Update for DAMON SeongJae Park

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