diff options
Diffstat (limited to 'arch/s390/appldata/appldata_mem.c')
| -rw-r--r-- | arch/s390/appldata/appldata_mem.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/arch/s390/appldata/appldata_mem.c b/arch/s390/appldata/appldata_mem.c new file mode 100644 index 000000000..e68136c3c --- /dev/null +++ b/arch/s390/appldata/appldata_mem.c @@ -0,0 +1,165 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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"); |