[mirror_ubuntu-artful-kernel.git] / arch / s390 / appldata / appldata_mem.c

/*
 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
 * Collects data related to memory management.
 *
 * Copyright IBM Corp. 2003, 2006
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <asm/io.h>

#include "appldata.h"


#define P2K(x) ((x) << (PAGE_SHIFT - 10))	/* Converts #Pages to KB */

/*
 * Memory data
 *
 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
 * the structure version (product ID, see appldata_base.c) needs to be changed
 * as well and all documentation and z/VM applications using it must be
 * updated.
 *
 * The record layout is documented in the Linux for zSeries Device Drivers
 * book:
 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
 */
struct appldata_mem_data {
	u64 timestamp;
	u32 sync_count_1;       /* after VM collected the record data, */
	u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
				   same. If not, the record has been updated on
				   the Linux side while VM was collecting the
				   (possibly corrupt) data */

	u64 pgpgin;		/* data read from disk  */
	u64 pgpgout;		/* data written to disk */
	u64 pswpin;		/* pages swapped in  */
	u64 pswpout;		/* pages swapped out */

	u64 sharedram;		/* sharedram is currently set to 0 */

	u64 totalram;		/* total main memory size */
	u64 freeram;		/* free main memory size  */
	u64 totalhigh;		/* total high memory size */
	u64 freehigh;		/* free high memory size  */

	u64 bufferram;		/* memory reserved for buffers, free cache */
	u64 cached;		/* size of (used) cache, w/o buffers */
	u64 totalswap;		/* total swap space size */
	u64 freeswap;		/* free swap space */

// New in 2.6 -->
	u64 pgalloc;		/* page allocations */
	u64 pgfault;		/* page faults (major+minor) */
	u64 pgmajfault;		/* page faults (major only) */
// <-- New in 2.6

} __packed;


/*
 * appldata_get_mem_data()
 *
 * gather memory data
 */
static void appldata_get_mem_data(void *data)
{
	/*
	 * don't put large structures on the stack, we are
	 * serialized through the appldata_ops_mutex and can use static
	 */
	static struct sysinfo val;
	unsigned long ev[NR_VM_EVENT_ITEMS];
	struct appldata_mem_data *mem_data;

	mem_data = data;
	mem_data->sync_count_1++;

	all_vm_events(ev);
	mem_data->pgpgin     = ev[PGPGIN] >> 1;
	mem_data->pgpgout    = ev[PGPGOUT] >> 1;
	mem_data->pswpin     = ev[PSWPIN];
	mem_data->pswpout    = ev[PSWPOUT];
	mem_data->pgalloc    = ev[PGALLOC_NORMAL];
	mem_data->pgalloc    += ev[PGALLOC_DMA];
	mem_data->pgfault    = ev[PGFAULT];
	mem_data->pgmajfault = ev[PGMAJFAULT];

	si_meminfo(&val);
	mem_data->sharedram = val.sharedram;
	mem_data->totalram  = P2K(val.totalram);
	mem_data->freeram   = P2K(val.freeram);
	mem_data->totalhigh = P2K(val.totalhigh);
	mem_data->freehigh  = P2K(val.freehigh);
	mem_data->bufferram = P2K(val.bufferram);
	mem_data->cached    = P2K(global_node_page_state(NR_FILE_PAGES)
				- val.bufferram);

	si_swapinfo(&val);
	mem_data->totalswap = P2K(val.totalswap);
	mem_data->freeswap  = P2K(val.freeswap);

	mem_data->timestamp = get_tod_clock();
	mem_data->sync_count_2++;
}


static struct appldata_ops ops = {
	.name      = "mem",
	.record_nr = APPLDATA_RECORD_MEM_ID,
	.size	   = sizeof(struct appldata_mem_data),
	.callback  = &appldata_get_mem_data,
	.owner     = THIS_MODULE,
	.mod_lvl   = {0xF0, 0xF0},		/* EBCDIC "00" */
};


/*
 * appldata_mem_init()
 *
 * init_data, register ops
 */
static int __init appldata_mem_init(void)
{
	int ret;

	ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
	if (!ops.data)
		return -ENOMEM;

	ret = appldata_register_ops(&ops);
	if (ret)
		kfree(ops.data);

	return ret;
}

/*
 * appldata_mem_exit()
 *
 * unregister ops
 */
static void __exit appldata_mem_exit(void)
{
	appldata_unregister_ops(&ops);
	kfree(ops.data);
}


module_init(appldata_mem_init);
module_exit(appldata_mem_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gerald Schaefer");
MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Data gathering module for Linux-VM Monitor Stream, Stage 1.
	3	* Collects data related to memory management.
	4	*
a53c8fab	5	* Copyright IBM Corp. 2003, 2006
1da177e4	6	*
5b5dd21a	7	* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
1da177e4 LT	8	*/
1da177e4 LT	9
1da177e4 LT	10	#include <linux/module.h>
1da177e4 LT	11	#include <linux/init.h>
1da177e4 LT	12	#include <linux/errno.h>
1da177e4 LT	13	#include <linux/kernel_stat.h>
1da177e4 LT	14	#include <linux/pagemap.h>
1da177e4 LT	15	#include <linux/swap.h>
f1a85820	16	#include <linux/slab.h>
d3ae942d	17	#include <asm/io.h>
1da177e4 LT	18
	19	#include "appldata.h"
	20
	21
1da177e4 LT	22	#define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */
	23
	24	/*
	25	* Memory data
	26	*
	27	* This is accessed as binary data by z/VM. If changes to it can't be avoided,
	28	* the structure version (product ID, see appldata_base.c) needs to be changed
	29	* as well and all documentation and z/VM applications using it must be
	30	* updated.
	31	*
	32	* The record layout is documented in the Linux for zSeries Device Drivers
	33	* book:
	34	* http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
	35	*/
a94f0fb1	36	struct appldata_mem_data {
1da177e4 LT	37	u64 timestamp;
	38	u32 sync_count_1; /* after VM collected the record data, */
	39	u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
	40	same. If not, the record has been updated on
	41	the Linux side while VM was collecting the
	42	(possibly corrupt) data */
	43
	44	u64 pgpgin; /* data read from disk */
	45	u64 pgpgout; /* data written to disk */
	46	u64 pswpin; /* pages swapped in */
	47	u64 pswpout; /* pages swapped out */
	48
	49	u64 sharedram; /* sharedram is currently set to 0 */
	50
	51	u64 totalram; /* total main memory size */
	52	u64 freeram; /* free main memory size */
	53	u64 totalhigh; /* total high memory size */
	54	u64 freehigh; /* free high memory size */
	55
	56	u64 bufferram; /* memory reserved for buffers, free cache */
	57	u64 cached; /* size of (used) cache, w/o buffers */
	58	u64 totalswap; /* total swap space size */
	59	u64 freeswap; /* free swap space */
	60
	61	// New in 2.6 -->
	62	u64 pgalloc; /* page allocations */
	63	u64 pgfault; /* page faults (major+minor) */
	64	u64 pgmajfault; /* page faults (major only) */
	65	// <-- New in 2.6
	66
a94f0fb1	67	} __packed;
1da177e4 LT	68
1da177e4 LT	69
1da177e4 LT	70	/*
	71	* appldata_get_mem_data()
	72	*
	73	* gather memory data
	74	*/
	75	static void appldata_get_mem_data(void *data)
	76	{
	77	/*
	78	* don't put large structures on the stack, we are
b1ad171e	79	* serialized through the appldata_ops_mutex and can use static
1da177e4 LT	80	*/
1da177e4 LT	81	static struct sysinfo val;
f8891e5e	82	unsigned long ev[NR_VM_EVENT_ITEMS];
1da177e4 LT	83	struct appldata_mem_data *mem_data;
	84
	85	mem_data = data;
	86	mem_data->sync_count_1++;
	87
f8891e5e CL	88	all_vm_events(ev);
	89	mem_data->pgpgin = ev[PGPGIN] >> 1;
	90	mem_data->pgpgout = ev[PGPGOUT] >> 1;
	91	mem_data->pswpin = ev[PSWPIN];
	92	mem_data->pswpout = ev[PSWPOUT];
bb81e605	93	mem_data->pgalloc = ev[PGALLOC_NORMAL];
bb81e605	94	mem_data->pgalloc += ev[PGALLOC_DMA];
f8891e5e CL	95	mem_data->pgfault = ev[PGFAULT];
f8891e5e CL	96	mem_data->pgmajfault = ev[PGMAJFAULT];
1da177e4 LT	97
	98	si_meminfo(&val);
	99	mem_data->sharedram = val.sharedram;
	100	mem_data->totalram = P2K(val.totalram);
	101	mem_data->freeram = P2K(val.freeram);
	102	mem_data->totalhigh = P2K(val.totalhigh);
	103	mem_data->freehigh = P2K(val.freehigh);
	104	mem_data->bufferram = P2K(val.bufferram);
11fb9989	105	mem_data->cached = P2K(global_node_page_state(NR_FILE_PAGES)
347ce434	106	- val.bufferram);
1da177e4 LT	107
	108	si_swapinfo(&val);
	109	mem_data->totalswap = P2K(val.totalswap);
	110	mem_data->freeswap = P2K(val.freeswap);
	111
1aae0560	112	mem_data->timestamp = get_tod_clock();
1da177e4	113	mem_data->sync_count_2++;
1da177e4 LT	114	}
	115
	116
	117	static struct appldata_ops ops = {
1da177e4 LT	118	.name = "mem",
	119	.record_nr = APPLDATA_RECORD_MEM_ID,
	120	.size = sizeof(struct appldata_mem_data),
	121	.callback = &appldata_get_mem_data,
1da177e4	122	.owner = THIS_MODULE,
5b5dd21a	123	.mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
1da177e4 LT	124	};
	125
	126
	127	/*
	128	* appldata_mem_init()
	129	*
	130	* init_data, register ops
	131	*/
	132	static int __init appldata_mem_init(void)
	133	{
a94f0fb1 SO	134	int ret;
	135
	136	ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
	137	if (!ops.data)
	138	return -ENOMEM;
	139
	140	ret = appldata_register_ops(&ops);
	141	if (ret)
	142	kfree(ops.data);
	143
	144	return ret;
1da177e4 LT	145	}
	146
	147	/*
	148	* appldata_mem_exit()
	149	*
	150	* unregister ops
	151	*/
	152	static void __exit appldata_mem_exit(void)
	153	{
	154	appldata_unregister_ops(&ops);
a94f0fb1	155	kfree(ops.data);
1da177e4 LT	156	}
	157
	158
	159	module_init(appldata_mem_init);
	160	module_exit(appldata_mem_exit);
	161
	162	MODULE_LICENSE("GPL");
	163	MODULE_AUTHOR("Gerald Schaefer");
	164	MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");