From: SeongJae Park <sjpark@amazon.com>
To: SeongJae Park <sjpark@amazon.com>
Cc: <akpm@linux-foundation.org>, <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>, <elver@google.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: [PATCH v21 10/18] mm/damon: Implement a debugfs-based user space interface
Date: Thu, 15 Oct 2020 17:22:26 +0200 [thread overview]
Message-ID: <20201015152226.7106-1-sjpark@amazon.com> (raw)
In-Reply-To: <20201005105522.23841-11-sjpark@amazon.com>
On Mon, 5 Oct 2020 12:55:14 +0200 SeongJae Park <sjpark@amazon.com> wrote:
> From: SeongJae Park <sjpark@amazon.de>
>
> DAMON is designed to be used by kernel space code such as the memory
> management subsystems, and therefore it provides only kernel space API.
> That said, letting the user space control DAMON could provide some
> benefits to them. For example, it will allow user space to analyze
> their specific workloads and make their own special optimizations.
>
> For such cases, this commit implements a simple DAMON application kernel
> module, namely 'damon-dbgfs', which merely wraps the DAMON api and
> exports those to the user space via the debugfs.
[...]
> +
> +static ssize_t dbgfs_monitor_on_write(struct file *file,
> + const char __user *buf, size_t count, loff_t *ppos)
> +{
> + ssize_t ret = count;
> + char *kbuf;
> + int err;
> +
> + kbuf = user_input_str(buf, count, ppos);
> + if (IS_ERR(kbuf))
> + return PTR_ERR(kbuf);
> +
> + /* Remove white space */
> + if (sscanf(kbuf, "%s", kbuf) != 1)
> + return -EINVAL;
> + if (!strncmp(kbuf, "on", count))
> + err = dbgfs_start_ctxs(dbgfs_ctxs, dbgfs_nr_ctxs);
> + else if (!strncmp(kbuf, "off", count))
> + err = damon_stop(dbgfs_ctxs, dbgfs_nr_ctxs);
> + else
> + return -EINVAL;
> +
> + if (err)
> + ret = err;
> + return ret;
'kbuf' should be freed before returning from this function. I will fix it in
the next version. To find more potential memory leaks, I ran 'kmemleak' after
a set of correctness tests[1], but it didn't find more leaks.
[1] https://github.com/awslabs/damon-tests/tree/master/corr
Thanks,
SeongJae Park
next prev parent reply other threads:[~2020-10-15 15:23 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-05 10:55 [PATCH v21 00/18] Introduce Data Access MONitor (DAMON) SeongJae Park
2020-10-05 10:55 ` [PATCH v21 01/18] mm: " SeongJae Park
2020-10-05 10:55 ` [PATCH v21 02/18] mm/damon: Implement region based sampling SeongJae Park
2020-10-05 10:55 ` [PATCH v21 03/18] mm/damon: Adaptively adjust regions SeongJae Park
2020-10-05 10:55 ` [PATCH v21 04/18] mm/damon: Track dynamic monitoring target regions update SeongJae Park
2020-10-05 10:55 ` [PATCH v21 05/18] mm/idle_page_tracking: Make PG_(idle|young) reusable SeongJae Park
2020-10-05 10:55 ` [PATCH v21 06/18] mm/damon: Implement primitives for the virtual memory address spaces SeongJae Park
2020-10-05 10:55 ` [PATCH v21 07/18] mm/page_idle: Avoid interferences from concurrent users SeongJae Park
2020-10-05 10:55 ` [PATCH v21 08/18] mm/damon/primitives: Make coexistable with Idle Page Tracking SeongJae Park
2020-10-05 10:55 ` [PATCH v21 09/18] mm/damon: Add a tracepoint SeongJae Park
2020-10-05 10:55 ` [PATCH v21 10/18] mm/damon: Implement a debugfs-based user space interface SeongJae Park
2020-10-15 15:22 ` SeongJae Park [this message]
2020-10-05 10:55 ` [PATCH v21 11/18] mm/damon/dbgfs: Implement recording feature SeongJae Park
2020-10-05 10:55 ` [PATCH v21 12/18] mm/damon/dbgfs: Export kdamond pid to the user space SeongJae Park
2020-10-05 10:55 ` [PATCH v21 13/18] mm/damon/dbgfs: Support multiple contexts SeongJae Park
2020-10-05 10:55 ` [PATCH v21 14/18] tools: Introduce a minimal user-space tool for DAMON SeongJae Park
2020-10-05 10:55 ` [PATCH v21 15/18] Documentation: Add documents " SeongJae Park
2020-10-05 10:55 ` [PATCH v21 16/18] mm/damon: Add kunit tests SeongJae Park
2020-10-05 10:55 ` [PATCH v21 17/18] mm/damon: Add user space selftests SeongJae Park
2020-10-05 10:55 ` [PATCH v21 18/18] MAINTAINERS: Update for DAMON SeongJae Park
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