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SubjectRe: [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@kernel.org>

For the sysfs stuff:

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

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