From: SeongJae Park <sjpark@amazon.com>
To: SeongJae Park <sjpark@amazon.com>
Cc: <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>,
<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>,
<david@redhat.com>, <linux-damon@amazon.com>,
<linux-mm@kvack.org>, <linux-doc@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v17 03/15] mm/damon: Implement region based sampling
Date: Tue, 7 Jul 2020 09:54:51 +0200 [thread overview]
Message-ID: <20200707075451.24606-1-sjpark@amazon.com> (raw)
In-Reply-To: <20200706115322.29598-4-sjpark@amazon.com> (raw)
On Mon, 6 Jul 2020 13:53:10 +0200 SeongJae Park <sjpark@amazon.com> wrote:
> From: SeongJae Park <sjpark@amazon.de>
>
> This commit implements DAMON's target address space independent high
> level logics for basic access check and region based sampling. This
> doesn't work alone, but needs the target address space specific low
> level pritimives implementation for the monitoring target address ranges
> construction and the access check, though. A reference implementation
> of those will be provided by a later commit. Nevertheless, users can
> implement and use their own versions for their specific use cases.
>
[...]
> +/**
> + * damon_start() - Starts monitoring with given context.
> + * @ctx: monitoring context
> + *
> + * Return: 0 on success, negative error code otherwise.
> + */
> +int damon_start(struct damon_ctx *ctx)
> +{
> + int err = -EBUSY;
> +
> + mutex_lock(&ctx->kdamond_lock);
> + if (!ctx->kdamond) {
> + err = 0;
> + ctx->kdamond_stop = false;
> + ctx->kdamond = kthread_run(kdamond_fn, ctx, "kdamond");
Oops, this means 'kdamond_fn' could see the unset '->kdamond'. I will use
'kthread_create()' and 'wake_up_process()' in the next spin.
> + if (IS_ERR(ctx->kdamond))
> + err = PTR_ERR(ctx->kdamond);
> + }
> + mutex_unlock(&ctx->kdamond_lock);
> +
> + return err;
> +}
So, the change would be something like below:
--- a/mm/damon.c
+++ b/mm/damon.c
@@ -1464,9 +1464,11 @@ int damon_start(struct damon_ctx *ctx)
if (!ctx->kdamond) {
err = 0;
ctx->kdamond_stop = false;
- ctx->kdamond = kthread_run(kdamond_fn, ctx, "kdamond");
+ ctx->kdamond = kthread_create(kdamond_fn, ctx, "kdamond");
if (IS_ERR(ctx->kdamond))
err = PTR_ERR(ctx->kdamond);
+ else
+ wake_up_process(ctx->kdamond);
}
mutex_unlock(&ctx->kdamond_lock);
Thanks,
SeongJae Park
next prev parent reply other threads:[~2020-07-07 7:55 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-06 11:53 [PATCH v17 00/15] Introduce Data Access MONitor (DAMON) SeongJae Park
2020-07-06 11:53 ` [PATCH v17 01/15] mm/page_ext: Export lookup_page_ext() to GPL modules SeongJae Park
2020-07-06 11:53 ` [PATCH v17 02/15] mm: Introduce Data Access MONitor (DAMON) SeongJae Park
2020-07-06 11:53 ` [PATCH v17 03/15] mm/damon: Implement region based sampling SeongJae Park
2020-07-07 7:54 ` SeongJae Park [this message]
2020-07-06 11:53 ` [PATCH v17 04/15] mm/damon: Adaptively adjust regions SeongJae Park
2020-07-06 11:53 ` [PATCH v17 05/15] mm/damon: Track dynamic monitoring target regions update SeongJae Park
2020-07-06 11:53 ` [PATCH v17 06/15] mm/damon: Implement callbacks for the virtual memory address spaces SeongJae Park
2020-07-06 11:53 ` [PATCH v17 07/15] mm/damon: Implement access pattern recording SeongJae Park
2020-07-06 11:53 ` [PATCH v17 08/15] mm/damon: Add a tracepoint SeongJae Park
2020-07-06 11:53 ` [PATCH v17 09/15] mm/damon: Implement a debugfs interface SeongJae Park
2020-07-06 11:53 ` [PATCH v17 10/15] tools: Introduce a minimal user-space tool for DAMON SeongJae Park
2020-07-06 11:53 ` [PATCH v17 11/15] tools/damon/wss: Implement '--thres' option SeongJae Park
2020-07-06 15:04 ` SeongJae Park
2020-07-06 11:53 ` [PATCH v17 12/15] Documentation/admin-guide/mm: Add a document for DAMON SeongJae Park
2020-07-07 7:49 ` Mike Rapoport
2020-07-07 8:07 ` SeongJae Park
2020-07-06 11:53 ` [PATCH v17 13/15] mm/damon: Add kunit tests SeongJae Park
2020-07-06 11:53 ` [PATCH v17 14/15] mm/damon: Add user space selftests SeongJae Park
2020-07-06 11:53 ` [PATCH v17 15/15] MAINTAINERS: Update for DAMON SeongJae Park
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