forked from Minki/linux
d03756aa05
s390 documentation now lives in IBM Knowledge Center, so update the link in the zfcpdump documentation. Also, remove the old developerWorks links from the appldata source code. Those were not really documentation related, but rather a reminder to the developer that some documentation has to be adjusted when changing the record layout, which should still be pretty obvious from the remaining comment. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
162 lines
4.0 KiB
C
162 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Data gathering module for Linux-VM Monitor Stream, Stage 1.
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* Collects data related to memory management.
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*
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* Copyright IBM Corp. 2003, 2006
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*
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* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/kernel_stat.h>
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include "appldata.h"
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#define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */
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/*
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* Memory data
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*
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* This is accessed as binary data by z/VM. If changes to it can't be avoided,
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* the structure version (product ID, see appldata_base.c) needs to be changed
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* as well and all documentation and z/VM applications using it must be
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* updated.
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*/
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struct appldata_mem_data {
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u64 timestamp;
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u32 sync_count_1; /* after VM collected the record data, */
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u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
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same. If not, the record has been updated on
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the Linux side while VM was collecting the
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(possibly corrupt) data */
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u64 pgpgin; /* data read from disk */
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u64 pgpgout; /* data written to disk */
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u64 pswpin; /* pages swapped in */
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u64 pswpout; /* pages swapped out */
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u64 sharedram; /* sharedram is currently set to 0 */
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u64 totalram; /* total main memory size */
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u64 freeram; /* free main memory size */
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u64 totalhigh; /* total high memory size */
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u64 freehigh; /* free high memory size */
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u64 bufferram; /* memory reserved for buffers, free cache */
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u64 cached; /* size of (used) cache, w/o buffers */
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u64 totalswap; /* total swap space size */
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u64 freeswap; /* free swap space */
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// New in 2.6 -->
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u64 pgalloc; /* page allocations */
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u64 pgfault; /* page faults (major+minor) */
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u64 pgmajfault; /* page faults (major only) */
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// <-- New in 2.6
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} __packed;
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/*
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* appldata_get_mem_data()
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*
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* gather memory data
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*/
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static void appldata_get_mem_data(void *data)
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{
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/*
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* don't put large structures on the stack, we are
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* serialized through the appldata_ops_mutex and can use static
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*/
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static struct sysinfo val;
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unsigned long ev[NR_VM_EVENT_ITEMS];
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struct appldata_mem_data *mem_data;
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mem_data = data;
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mem_data->sync_count_1++;
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all_vm_events(ev);
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mem_data->pgpgin = ev[PGPGIN] >> 1;
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mem_data->pgpgout = ev[PGPGOUT] >> 1;
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mem_data->pswpin = ev[PSWPIN];
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mem_data->pswpout = ev[PSWPOUT];
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mem_data->pgalloc = ev[PGALLOC_NORMAL];
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mem_data->pgalloc += ev[PGALLOC_DMA];
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mem_data->pgfault = ev[PGFAULT];
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mem_data->pgmajfault = ev[PGMAJFAULT];
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si_meminfo(&val);
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mem_data->sharedram = val.sharedram;
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mem_data->totalram = P2K(val.totalram);
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mem_data->freeram = P2K(val.freeram);
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mem_data->totalhigh = P2K(val.totalhigh);
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mem_data->freehigh = P2K(val.freehigh);
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mem_data->bufferram = P2K(val.bufferram);
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mem_data->cached = P2K(global_node_page_state(NR_FILE_PAGES)
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- val.bufferram);
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si_swapinfo(&val);
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mem_data->totalswap = P2K(val.totalswap);
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mem_data->freeswap = P2K(val.freeswap);
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mem_data->timestamp = get_tod_clock();
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mem_data->sync_count_2++;
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}
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static struct appldata_ops ops = {
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.name = "mem",
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.record_nr = APPLDATA_RECORD_MEM_ID,
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.size = sizeof(struct appldata_mem_data),
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.callback = &appldata_get_mem_data,
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.owner = THIS_MODULE,
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.mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
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};
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/*
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* appldata_mem_init()
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*
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* init_data, register ops
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*/
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static int __init appldata_mem_init(void)
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{
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int ret;
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ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
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if (!ops.data)
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return -ENOMEM;
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ret = appldata_register_ops(&ops);
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if (ret)
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kfree(ops.data);
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return ret;
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}
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/*
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* appldata_mem_exit()
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*
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* unregister ops
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*/
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static void __exit appldata_mem_exit(void)
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{
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appldata_unregister_ops(&ops);
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kfree(ops.data);
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}
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module_init(appldata_mem_init);
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module_exit(appldata_mem_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Gerald Schaefer");
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MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");
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