On Wed, Feb 10, 2021 at 12:05:48AM -0800, John Hubbard wrote: > On 2/9/21 11:55 PM, 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@xxxxxxxxxx> > > --- > > Looks good. > > Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx> Thanks for reviewing, John and Greg!
