Merge "zram: Register with show_mem notification framework" (12562145) · Commits · e / devices / android_kernel_sony_msm8994

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;