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/**
* Copyright (C) ARM Limited 2010-2012. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include "gator.h"
#include <linux/workqueue.h>
#include <trace/events/kmem.h>
#include <linux/hardirq.h>
#define MEMINFO_MEMFREE 0
#define MEMINFO_MEMUSED 1
#define MEMINFO_BUFFERRAM 2
#define MEMINFO_TOTAL 3
static ulong meminfo_global_enabled;
static ulong meminfo_enabled[MEMINFO_TOTAL];
static ulong meminfo_key[MEMINFO_TOTAL];
static unsigned long long meminfo_buffer[MEMINFO_TOTAL * 2];
static int meminfo_length = 0;
static unsigned int mem_event = 0;
static bool new_data_avail;
static void wq_sched_handler(struct work_struct *wsptr);
DECLARE_WORK(work, wq_sched_handler);
static struct timer_list meminfo_wake_up_timer;
static void meminfo_wake_up_handler(unsigned long unused_data);
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
GATOR_DEFINE_PROBE(mm_page_free_direct, TP_PROTO(struct page *page, unsigned int order)) {
#else
GATOR_DEFINE_PROBE(mm_page_free, TP_PROTO(struct page *page, unsigned int order)) {
#endif
mem_event++;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
GATOR_DEFINE_PROBE(mm_pagevec_free, TP_PROTO(struct page *page, int cold)) {
#else
GATOR_DEFINE_PROBE(mm_page_free_batched, TP_PROTO(struct page *page, int cold)) {
#endif
mem_event++;
}
GATOR_DEFINE_PROBE(mm_page_alloc, TP_PROTO(struct page *page, unsigned int order, gfp_t gfp_flags, int migratetype)) {
mem_event++;
}
static int gator_events_meminfo_create_files(struct super_block *sb, struct dentry *root)
{
struct dentry *dir;
int i;
for (i = 0; i < MEMINFO_TOTAL; i++) {
switch (i) {
case MEMINFO_MEMFREE:
dir = gatorfs_mkdir(sb, root, "Linux_meminfo_memfree");
break;
case MEMINFO_MEMUSED:
dir = gatorfs_mkdir(sb, root, "Linux_meminfo_memused");
break;
case MEMINFO_BUFFERRAM:
dir = gatorfs_mkdir(sb, root, "Linux_meminfo_bufferram");
break;
default:
return -1;
}
if (!dir) {
return -1;
}
gatorfs_create_ulong(sb, dir, "enabled", &meminfo_enabled[i]);
gatorfs_create_ro_ulong(sb, dir, "key", &meminfo_key[i]);
}
return 0;
}
static int gator_events_meminfo_start(void)
{
int i;
new_data_avail = true;
for (i = 0; i < MEMINFO_TOTAL; i++) {
if (meminfo_enabled[i]) {
meminfo_global_enabled = 1;
}
}
if (meminfo_global_enabled == 0)
return 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
if (GATOR_REGISTER_TRACE(mm_page_free_direct))
#else
if (GATOR_REGISTER_TRACE(mm_page_free))
#endif
goto mm_page_free_exit;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
if (GATOR_REGISTER_TRACE(mm_pagevec_free))
#else
if (GATOR_REGISTER_TRACE(mm_page_free_batched))
#endif
goto mm_page_free_batched_exit;
if (GATOR_REGISTER_TRACE(mm_page_alloc))
goto mm_page_alloc_exit;
setup_timer(&meminfo_wake_up_timer, meminfo_wake_up_handler, 0);
return 0;
mm_page_alloc_exit:
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
GATOR_UNREGISTER_TRACE(mm_pagevec_free);
#else
GATOR_UNREGISTER_TRACE(mm_page_free_batched);
#endif
mm_page_free_batched_exit:
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
GATOR_UNREGISTER_TRACE(mm_page_free_direct);
#else
GATOR_UNREGISTER_TRACE(mm_page_free);
#endif
mm_page_free_exit:
return -1;
}
static void gator_events_meminfo_stop(void)
{
int i;
if (meminfo_global_enabled) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
GATOR_UNREGISTER_TRACE(mm_page_free_direct);
GATOR_UNREGISTER_TRACE(mm_pagevec_free);
#else
GATOR_UNREGISTER_TRACE(mm_page_free);
GATOR_UNREGISTER_TRACE(mm_page_free_batched);
#endif
GATOR_UNREGISTER_TRACE(mm_page_alloc);
}
del_timer_sync(&meminfo_wake_up_timer);
meminfo_global_enabled = 0;
for (i = 0; i < MEMINFO_TOTAL; i++) {
meminfo_enabled[i] = 0;
}
}
// Must be run in process context as the kernel function si_meminfo() can sleep
static void wq_sched_handler(struct work_struct *wsptr)
{
struct sysinfo info;
int i, len;
unsigned long long value;
meminfo_length = len = 0;
si_meminfo(&info);
for (i = 0; i < MEMINFO_TOTAL; i++) {
if (meminfo_enabled[i]) {
switch (i) {
case MEMINFO_MEMFREE:
value = info.freeram * PAGE_SIZE;
break;
case MEMINFO_MEMUSED:
value = (info.totalram - info.freeram) * PAGE_SIZE;
break;
case MEMINFO_BUFFERRAM:
value = info.bufferram * PAGE_SIZE;
break;
default:
value = 0;
break;
}
meminfo_buffer[len++] = (unsigned long long)meminfo_key[i];
meminfo_buffer[len++] = value;
}
}
meminfo_length = len;
new_data_avail = true;
}
static void meminfo_wake_up_handler(unsigned long unused_data)
{
// had to delay scheduling work as attempting to schedule work during the context switch is illegal in kernel versions 3.5 and greater
schedule_work(&work);
}
static int gator_events_meminfo_read(long long **buffer)
{
static unsigned int last_mem_event = 0;
if (smp_processor_id() || !meminfo_global_enabled)
return 0;
if (last_mem_event != mem_event) {
last_mem_event = mem_event;
mod_timer(&meminfo_wake_up_timer, jiffies + 1);
}
if (!new_data_avail)
return 0;
new_data_avail = false;
if (buffer)
*buffer = meminfo_buffer;
return meminfo_length;
}
static struct gator_interface gator_events_meminfo_interface = {
.create_files = gator_events_meminfo_create_files,
.start = gator_events_meminfo_start,
.stop = gator_events_meminfo_stop,
.read64 = gator_events_meminfo_read,
};
int gator_events_meminfo_init(void)
{
int i;
meminfo_global_enabled = 0;
for (i = 0; i < MEMINFO_TOTAL; i++) {
meminfo_enabled[i] = 0;
meminfo_key[i] = gator_events_get_key();
}
return gator_events_install(&gator_events_meminfo_interface);
}
gator_events_init(gator_events_meminfo_init);
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