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-rw-r--r--arch/s390/appldata/appldata_mem.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/arch/s390/appldata/appldata_mem.c b/arch/s390/appldata/appldata_mem.c
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index 000000000..21c3147bd
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+++ b/arch/s390/appldata/appldata_mem.c
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+// 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.
+ */
+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");