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mm: cma: Register with show_mem notification framework

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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: Prakash Gupta <[email protected]>
[<[email protected]: Fix trivial errors in commit text]
Signed-off-by: Swathi Sridhar <[email protected]>
[[email protected]: Fix trivial merge conflicts]
Signed-off-by: Isaac J. Manjarres <[email protected]>
This commit is contained in:
Prakash Gupta 2017-08-02 12:30:55 +05:30 • committed by Gerrit - the friendly Code Review server
commit 6135095109
1 changed files with 26 additions and 0 deletions
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26
mm/cma.c
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@ -34,6 +34,7 @@
#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"
@ -96,6 +97,29 @@ 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);
@ -158,6 +182,8 @@ static int __init cma_init_reserved_areas(void)
return ret;
}
show_mem_notifier_register(&cma_nb);
return 0;
}
core_initcall(cma_init_reserved_areas);