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From: SeongJae Park <sj38.park@gmail.com>
To: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Cc: SeongJae Park <sjpark@amazon.com>,
	akpm@linux-foundation.org, SeongJae Park <sjpark@amazon.de>,
	aarcange@redhat.com, yang.shi@linux.alibaba.com, acme@kernel.org,
	alexander.shishkin@linux.intel.com, amit@kernel.org,
	brendan.d.gregg@gmail.com, brendanhiggins@google.com, cai@lca.pw,
	colin.king@canonical.com, corbet@lwn.net, dwmw@amazon.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,
	rientjes@google.com, rostedt@goodmis.org, shuah@kernel.org,
	sj38.park@gmail.com, vbabka@suse.cz, vdavydov.dev@gmail.com,
	linux-mm@kvack.org, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: Re: [PATCH v6 02/14] mm/damon: Implement region based sampling
Date: Fri, 13 Mar 2020 21:16:49 +0100
Message-ID: <20200313201649.26646-1-sj38.park@gmail.com> (raw)
In-Reply-To: <20200313172954.00001f3c@Huawei.com> (raw)

On Fri, 13 Mar 2020 17:29:54 +0000 Jonathan Cameron <Jonathan.Cameron@Huawei.com> wrote:

> On Mon, 24 Feb 2020 13:30:35 +0100
> SeongJae Park <sjpark@amazon.com> wrote:
> 
> > From: SeongJae Park <sjpark@amazon.de>
> > 
> > This commit implements DAMON's basic access check and region based
> > sampling mechanisms.  This change would seems make no sense, mainly
> > because it is only a part of the DAMON's logics.  Following two commits
> > will make more sense.
> > 
[...]
> 
> Came across a minor issue inline.  kthread_run calls kthread_create.
> That gives a potential sleep while atomic issue given the spin lock.
> 
> Can probably be fixed by preallocating the thread then starting it later.
> 
> Jonathan
[...]
> > +/*
> > + * Start or stop the kdamond
> > + *
> > + * Returns 0 if success, negative error code otherwise.
> > + */
> > +static int damon_turn_kdamond(struct damon_ctx *ctx, bool on)
> > +{
> > +	spin_lock(&ctx->kdamond_lock);
> > +	ctx->kdamond_stop = !on;
> > +	if (!ctx->kdamond && on) {
> > +		ctx->kdamond = kthread_run(kdamond_fn, ctx, "kdamond");
> 
> Can't do this under a spin lock.

Good catch!  And, agree to your suggestion.  I will fix this in that way!


Thanks,
SeongJae Park


  reply index

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24 12:30 [PATCH v6 00/14] Introduce Data Access MONitor (DAMON) SeongJae Park
2020-02-24 12:30 ` [PATCH v6 01/14] mm: " SeongJae Park
2020-03-10  8:54   ` Jonathan Cameron
2020-03-10 11:50     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 02/14] mm/damon: Implement region based sampling SeongJae Park
2020-03-10  8:57   ` Jonathan Cameron
2020-03-10 11:52     ` SeongJae Park
2020-03-10 15:55       ` Jonathan Cameron
2020-03-10 16:22         ` SeongJae Park
2020-03-10 17:39           ` Jonathan Cameron
2020-03-12  9:20             ` SeongJae Park
2020-03-13 17:29   ` Jonathan Cameron
2020-03-13 20:16     ` SeongJae Park [this message]
2020-03-17 11:32       ` Re: " SeongJae Park
2020-02-24 12:30 ` [PATCH v6 03/14] mm/damon: Adaptively adjust regions SeongJae Park
2020-03-10  8:57   ` Jonathan Cameron
2020-03-10 11:53     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 04/14] mm/damon: Apply dynamic memory mapping changes SeongJae Park
2020-03-10  9:00   ` Jonathan Cameron
2020-03-10 11:53     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 05/14] mm/damon: Implement callbacks SeongJae Park
2020-03-10  9:01   ` Jonathan Cameron
2020-03-10 11:55     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 06/14] mm/damon: Implement access pattern recording SeongJae Park
2020-03-10  9:01   ` Jonathan Cameron
2020-03-10 11:55     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 07/14] mm/damon: Implement kernel space API SeongJae Park
2020-03-10  9:01   ` Jonathan Cameron
2020-03-10 11:56     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 08/14] mm/damon: Add debugfs interface SeongJae Park
2020-03-10  9:02   ` Jonathan Cameron
2020-03-10 11:56     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 09/14] mm/damon: Add a tracepoint for result writing SeongJae Park
2020-03-10  9:03   ` Jonathan Cameron
2020-03-10 11:57     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 10/14] tools: Add a minimal user-space tool for DAMON SeongJae Park
2020-02-24 12:30 ` [PATCH v6 11/14] Documentation/admin-guide/mm: Add a document " SeongJae Park
2020-03-10  9:03   ` Jonathan Cameron
2020-03-10 11:57     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 12/14] mm/damon: Add kunit tests SeongJae Park
2020-02-24 12:30 ` [PATCH v6 13/14] mm/damon: Add user selftests SeongJae Park
2020-02-24 12:30 ` [PATCH v6 14/14] MAINTAINERS: Update for DAMON SeongJae Park
2020-03-02 11:35 ` [PATCH v6 00/14] Introduce Data Access MONitor (DAMON) SeongJae Park
2020-03-09 10:23   ` SeongJae Park
2020-03-10 17:21 ` Shakeel Butt
2020-03-12 10:07   ` SeongJae Park
2020-03-12 10:43     ` SeongJae Park
2020-03-18 19:52       ` Shakeel Butt
2020-03-19  9:03         ` SeongJae Park
2020-03-23 17:29           ` Shakeel Butt
2020-03-24  8:34             ` SeongJae Park

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