linux-kernel - Re: [PATCH v3] mm: cma: support sysfs

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Message-ID: <YCOTK7ojKCxFmqcI@kroah.com>
Date:   Wed, 10 Feb 2021 09:02:51 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, jhubbard@...dia.com,
        willy@...radead.org, surenb@...gle.com, joaodias@...gle.com,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH v3] mm: cma: support sysfs

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@...nel.org>

For the sysfs stuff:

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>