From: Greg KH <gregkh@linuxfoundation.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
jhubbard@nvidia.com, willy@infradead.org, surenb@google.com,
joaodias@google.com, LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [PATCH v3] mm: cma: support sysfs
Date: Wed, 10 Feb 2021 09:02:51 +0100 [thread overview]
Message-ID: <YCOTK7ojKCxFmqcI@kroah.com> (raw)
In-Reply-To: <20210210075509.3788729-1-minchan@kernel.org>
On Tue, Feb 09, 2021 at 11:55:09PM -0800, Minchan Kim wrote:
> Since CMA is getting used more widely, it's more important to
> keep monitoring CMA statistics for system health since it's
> directly related to user experience.
>
> This patch introduces sysfs statistics for CMA, in order to provide
> some basic monitoring of the CMA allocator.
>
> * the number of CMA page allocation attempts
> * the number of CMA page allocation failures
>
> These two values allow the user to calcuate the allocation
> failure rate for each CMA area.
>
> e.g.)
> /sys/kernel/mm/cma/WIFI/cma_alloc_pages_[attempts|fails]
> /sys/kernel/mm/cma/SENSOR/cma_alloc_pages_[attempts|fails]
> /sys/kernel/mm/cma/BLUETOOTH/cma_alloc_pages_[attempts|fails]
>
> Signed-off-by: Minchan Kim <minchan@kernel.org>
For the sysfs stuff:
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
next prev parent reply other threads:[~2021-02-10 8:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 7:55 [PATCH v3] mm: cma: support sysfs Minchan Kim
2021-02-10 8:02 ` Greg KH [this message]
2021-02-10 8:05 ` John Hubbard
2021-02-10 15:59 ` Minchan Kim
-- strict thread matches above, loose matches on Subject: below --
2021-03-03 20:50 Minchan Kim
2021-03-03 22:44 ` Andrew Morton
2021-03-04 1:38 ` Minchan Kim
2021-03-04 6:09 ` Andrew Morton
2021-03-04 15:39 ` Minchan Kim
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