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Commit 883e44f7 authored by Prakash Gupta's avatar Prakash Gupta Committed by Swathi Sridhar
Browse files

mm: cma: Register with show_mem notification framework 



Register with the show_mem notification framework
to let cma dump out data for debugging.

This is an example output with this patch.

 cma: cma-0 pages: => 0 used of 2048 total pages
 cma: cma-1 pages: => 0 used of 23552 total pages
 cma: cma-2 pages: => 1696 used of 3072 total pages
 cma: cma-3 pages: => 8277 used of 9216 total pages
 cma: cma-4 pages: => 186 used of 5120 total pages
 cma: cma-5 pages: => 3792 used of 8192 total pages.

Change-Id: I80d9291444fd9361f5586bdf60373ed8b5b41705
Signed-off-by: default avatarPrakash Gupta <guptap@codeaurora.org>
[<swatsrid@codeaurora.org: Fix trivial errors in commit text]
Signed-off-by: default avatarSwathi Sridhar <swatsrid@codeaurora.org>
parent 9ecc13db

mm/cma.c

+26 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ 
#include <linux/io.h>

#include <linux/kmemleak.h>

#include <linux/delay.h>

#include <linux/show_mem_notifier.h>

#include <trace/events/cma.h>



#include "cma.h"
@@ -98,6 +99,29 @@ static void cma_clear_bitmap(struct cma *cma, unsigned long pfn, 
	mutex_unlock(&cma->lock);

}



static int cma_showmem_notifier(struct notifier_block *nb,

				   unsigned long action, void *data)

{

	int i;

	unsigned long used;

	struct cma *cma;



	for (i = 0; i < cma_area_count; i++) {

		cma = &cma_areas[i];

		used = bitmap_weight(cma->bitmap,

				     (int)cma_bitmap_maxno(cma));

		used <<= cma->order_per_bit;

		pr_info("cma-%d pages: => %lu used of %lu total pages\n",

			i, used, cma->count);

	}



	return 0;

}



static struct notifier_block cma_nb = {

	.notifier_call = cma_showmem_notifier,

};



static int __init cma_activate_area(struct cma *cma)

{

	int bitmap_size = BITS_TO_LONGS(cma_bitmap_maxno(cma)) * sizeof(long);
@@ -162,6 +186,8 @@ static int __init cma_init_reserved_areas(void) 
			return ret;

	}



	show_mem_notifier_register(&cma_nb);



	return 0;

}

core_initcall(cma_init_reserved_areas);