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b1ad171efa
The appldata_ops callbacks are called with a spin_lock held. But the appldata_mem callback then calls all_vm_events(), which calls get_online_cpus(), which might sleep. This possible deadlock is fixed by using a mutex instead of a spin_lock. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/*
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* arch/s390/appldata/appldata_mem.c
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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 (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
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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/slab.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 <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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* The record layout is documented in the Linux for zSeries Device Drivers
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* book:
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* http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
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*/
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static 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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} __attribute__((packed)) appldata_mem_data;
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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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#ifdef CONFIG_ZONE_DMA
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mem_data->pgalloc += ev[PGALLOC_DMA];
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#endif
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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_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_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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.data = &appldata_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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return appldata_register_ops(&ops);
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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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}
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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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