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From: Marco Elver <elver@google.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, david@redhat.com,
	dwmw@amazon.com, fan.du@intel.com, foersleo@amazon.de,
	gthelen@google.com, 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, rppt@kernel.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, zgf574564920@gmail.com,
	linux-damon@amazon.com, linux-mm@kvack.org,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC v8 01/10] mm/damon/debugfs: Allow users to set initial monitoring target regions
Date: Mon, 31 Aug 2020 20:08:44 +0200	[thread overview]
Message-ID: <20200831180844.GA3992970@elver.google.com> (raw)
In-Reply-To: <20200831104730.28970-2-sjpark@amazon.com>

On Mon, Aug 31, 2020 at 12:47PM +0200, SeongJae Park wrote:
[...]
> diff --git a/mm/damon.c b/mm/damon.c
> index 7e3c8c82a010..9815d22fc4de 100644
> --- a/mm/damon.c
> +++ b/mm/damon.c
> @@ -2001,6 +2001,147 @@ static ssize_t debugfs_record_write(struct file *file,
>  	return ret;
>  }
>  
> +static ssize_t sprint_init_regions(struct damon_ctx *c, char *buf, ssize_t len)
> +{
> +	struct damon_target *t;
> +	struct damon_region *r;
> +	int written = 0;
> +	int rc;
> +
> +	damon_for_each_target(t, c) {
> +		damon_for_each_region(r, t) {
> +			rc = snprintf(&buf[written], len - written,
> +					"%lu %lu %lu\n",
> +					t->id, r->ar.start, r->ar.end);

This most likely will not work as intended, because snprintf() returns
"[...] the number of characters which would be generated for the given
input, excluding the trailing null [...]". Would scnprintf() -- which
returns "[...] the number of characters written into @buf not including
the trailing '\0' [...]" -- do what you intended?

> +			if (!rc)
> +				return -ENOMEM;
> +			written += rc;
> +		}
> +	}
> +	return written;
> +}
[...]


  reply	other threads:[~2020-08-31 18:08 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-31 10:47 [RFC v8 00/10] DAMON: Support Physical Memory Address Space Monitoring SeongJae Park
2020-08-31 10:47 ` [RFC v8 01/10] mm/damon/debugfs: Allow users to set initial monitoring target regions SeongJae Park
2020-08-31 18:08   ` Marco Elver [this message]
2020-09-01  6:35     ` SeongJae Park
2020-08-31 10:47 ` [RFC v8 02/10] tools/damon: Support init target regions specification SeongJae Park
2020-08-31 10:47 ` [RFC v8 03/10] mm/damon-test: Add more unit tests for 'init_regions' SeongJae Park
2020-08-31 10:47 ` [RFC v8 04/10] selftests/damon/_chk_record: Do not check number of gaps SeongJae Park
2020-08-31 10:47 ` [RFC v8 05/10] Docs/admin-guide/mm/damon: Document 'init_regions' feature SeongJae Park
2020-08-31 10:47 ` [RFC v8 06/10] mm/damon: Implement callbacks for physical memory monitoring SeongJae Park
2020-08-31 10:47 ` [RFC v8 07/10] mm/damon/debugfs: Support " SeongJae Park
2020-08-31 10:47 ` [RFC v8 08/10] tools/damon/record: " SeongJae Park
2020-08-31 10:47 ` [RFC v8 09/10] tools/damon/record: Support NUMA specific recording SeongJae Park
2020-08-31 10:47 ` [RFC v8 10/10] Docs/DAMON: Document physical memory monitoring support SeongJae Park
2020-09-01  6:37 ` [RFC v8 00/10] DAMON: Support Physical Memory Address Space Monitoring SeongJae Park

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