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 [thread overview]
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
next prev parent reply other threads:[~2020-03-13 20:17 UTC|newest]
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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