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161 lines
4.0 KiB
161 lines
4.0 KiB
// 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 <[email protected]> |
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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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