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Commit e5bc0581 authored by Laura Abbott's avatar Laura Abbott
Browse files

zram: Register with show_mem notification framework 



Zram data is useful when looking at memory related issues.
Register with the show_mem framework so data can be
dumped at convenient times.

Change-Id: I1709f1301edc705445f5fc288d9fc2455638e41a
Signed-off-by: default avatarLaura Abbott <lauraa@codeaurora.org>
parent d2da88f4

drivers/staging/zram/zram_drv.c

+39 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
#include <linux/string.h>

#include <linux/vmalloc.h>

#include <linux/ratelimit.h>

#include <linux/show_mem_notifier.h>



#include "zram_drv.h"
@@ -49,6 +50,43 @@ static struct zram *zram_devices; 
/* Module params (documentation at end) */

static unsigned int num_devices = 1;



static int zram_show_mem_notifier(struct notifier_block *nb,

				unsigned long action,

				void *data)

{

	int i;



	if (!zram_devices)

		return 0;



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

		struct zram *zram = &zram_devices[i];

		struct zram_meta *meta = zram->meta;



		if (!down_read_trylock(&zram->init_lock))

			continue;



		if (zram->init_done) {

			u64 val;



			val = zs_get_total_size_bytes(meta->mem_pool);

			pr_info("Zram[%d] mem_used_total = %llu\n", i, val);

			pr_info("Zram[%d] compr_data_size = %llu\n", i,

				atomic64_read(&zram->stats.compr_size));

			pr_info("Zram[%d] orig_data_size = %u\n", i,

				zram->stats.pages_stored);

		}



		up_read(&zram->init_lock);

	}



	return 0;

}



static struct notifier_block zram_show_mem_notifier_block = {

	.notifier_call = zram_show_mem_notifier

};



static inline struct zram *dev_to_zram(struct device *dev)

{

	return (struct zram *)dev_to_disk(dev)->private_data;
@@ -947,6 +985,7 @@ static int __init zram_init(void) 
			goto free_devices;

	}



	show_mem_notifier_register(&zram_show_mem_notifier_block);

	pr_info("Created %u device(s) ...\n", num_devices);



	return 0;