[IMPROVE] calculation of energy data

energy data:
	CPU time
	the number of bytes read
	the number of bytes written

diff --git a/energy/swap_energy.c b/energy/swap_energy.c
index 6f1fd5a..f443548 100644 (file)
--- a/energy/swap_energy.c
+++ b/energy/swap_energy.c
@@ -1,7 +1,93 @@
+/*
+ *  Dynamic Binary Instrumentation Module based on KProbes
+ *  modules/energy/swap_energy.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) Samsung Electronics, 2013
+ *
+ * 2013         Vasiliy Ulyanov <v.ulyanov@samsung.com>
+ *              Vyacheslav Cherkashin <v.cherkashin@samsung.com>
+ *
+ */
+
+
 #include <linux/module.h>
 #include <linux/time.h>
+#include <linux/file.h>
+#include <linux/spinlock.h>
+#include <linux/magic.h>
+#include <linux/slab.h>
 #include <kprobe/dbi_kprobes.h>
 #include <ksyms/ksyms.h>
+#include <us_manager/sspt/sspt_proc.h>
+#include <us_manager/sspt/sspt_feature.h>
+
+
+struct energy_data {
+       /* for __switch_to */
+       u64 time[NR_CPUS];
+       u64 time_tmp[NR_CPUS];
+
+       /* for sys_read */
+       u64 sys_read_byte;
+       spinlock_t sys_read_lock;
+
+       /*for sys_write */
+       u64 sys_write_byte;
+       spinlock_t sys_write_lock;
+};
+
+static sspt_feature_id_t feature_id = SSPT_FEATURE_ID_BAD;
+
+static void *create_ed(void)
+{
+       struct energy_data *ed;
+
+       ed = kmalloc(sizeof(*ed), GFP_ATOMIC);
+       if (ed) {
+               memset(ed, 0, sizeof(*ed));
+               spin_lock_init(&ed->sys_read_lock);
+               spin_lock_init(&ed->sys_write_lock);
+       }
+
+       return (void *)ed;
+}
+
+static void destroy_ed(void *data)
+{
+       struct energy_data *ed = (struct energy_data *)data;
+       kfree(ed);
+}
+
+
+static int init_feature(void)
+{
+       feature_id = sspt_register_feature(create_ed, destroy_ed);
+
+       if (feature_id == SSPT_FEATURE_ID_BAD)
+               return -EPERM;
+
+       return 0;
+}
+
+static void uninit_feature(void)
+{
+       sspt_unregister_feature(feature_id);
+       feature_id = SSPT_FEATURE_ID_BAD;
+}
 
 static u64 get_ntime(void)
 {
@@ -12,17 +98,89 @@ static u64 get_ntime(void)
        return (u64)ts.tv_sec * 1000*1000*1000 + ts.tv_nsec;
 }
 
+static struct energy_data *get_energy_data(struct task_struct *task)
+{
+       void *data = NULL;
+       struct sspt_proc *proc;
+
+       proc = sspt_proc_get_by_task(task);
+       if (proc)
+               data = sspt_get_feature_data(proc->feature, feature_id);
+
+       return (struct energy_data *)data;
+}
+
+static int check_fs(unsigned long magic)
+{
+       switch (magic) {
+       case EXT2_SUPER_MAGIC: /* == EXT3_SUPER_MAGIC == EXT4_SUPER_MAGIC */
+       case MSDOS_SUPER_MAGIC:
+               return 1;
+       }
+
+       return 0;
+}
+
+static int check_ftype(int fd)
+{
+       int err, ret = 0;
+       struct kstat kstat;
+
+       err = vfs_fstat(fd, &kstat);
+       if (err == 0 && S_ISREG(kstat.mode))
+               ret = 1;
+
+       return ret;
+}
+
+static unsigned long get_arg0(struct pt_regs *regs)
+{
+#if defined(CONFIG_ARM)
+       return regs->ARM_r0;
+#elif defined(CONFIG_X86_32)
+       return regs->bx;
+#else
+       #error "this architecture is not supported"
+#endif /* CONFIG_arch */
+}
+
+
+
+
+
 /* ============================================================================
  * =                             __switch_to                                  =
  * ============================================================================
  */
 static int entry_handler_switch(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
+       struct energy_data *ed;
+
+       ed = get_energy_data(current);
+       if (ed) {
+               int cpu = task_cpu(current);
+
+               if (ed->time_tmp[cpu]) {
+                       ed->time[cpu] += get_ntime() - ed->time_tmp[cpu];
+                       ed->time_tmp[cpu] = 0;
+               }
+       }
+
        return 0;
 }
 
 static int ret_handler_switch(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
+       struct energy_data *ed;
+
+       ed = get_energy_data(current);
+       if (ed) {
+               int cpu;
+
+               cpu = task_cpu(current);
+               ed->time_tmp[cpu] = get_ntime();
+       }
+
        return 0;
 }
 
@@ -39,19 +197,68 @@ static struct kretprobe switch_to_krp = {
  * =                                sys_read                                  =
  * ============================================================================
  */
+struct sys_read_data {
+       int fd;
+};
+
 static int entry_handler_sys_read(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
+       struct sys_read_data *srd = (struct sys_read_data *)ri->data;
+
+       srd->fd = (int)get_arg0(regs);
+
        return 0;
 }
 
-static int ret_handler_sys_read(struct kretprobe_instance *ri, struct pt_regs *regs)
+static struct energy_data *get_and_check_energy_data(int fd)
+{
+       struct energy_data *ed;
+       ed = get_energy_data(current);
+       if (ed) {
+               struct file *file;
+
+               file = fget(fd);
+               if (file) {
+                       int magic = 0;
+                       if (file->f_dentry && file->f_dentry->d_sb)
+                               magic = file->f_dentry->d_sb->s_magic;
+
+                       fput(file);
+
+                       if (check_fs(magic) && check_ftype(fd))
+                               return ed;
+               }
+       }
+
+       return NULL;
+}
+
+static int ret_handler_sys_read(struct kretprobe_instance *ri,
+                               struct pt_regs *regs)
 {
+       int ret = regs_return_value(regs);
+
+       if (ret > 0) {
+               struct energy_data *ed;
+               struct sys_read_data *srd;
+
+               srd = (struct sys_read_data *)ri->data;
+               ed = get_and_check_energy_data(srd->fd);
+
+               if (ed) {
+                       spin_lock(&ed->sys_read_lock);
+                       ed->sys_read_byte += ret;
+                       spin_unlock(&ed->sys_read_lock);
+               }
+       }
+
        return 0;
 }
 
 static struct kretprobe sys_read_krp = {
        .entry_handler = entry_handler_sys_read,
        .handler = ret_handler_sys_read,
+       .data_size = sizeof(struct sys_read_data)
 };
 
 
@@ -64,17 +271,37 @@ static struct kretprobe sys_read_krp = {
  */
 static int entry_handler_sys_write(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
+       struct sys_read_data *srd = (struct sys_read_data *)ri->data;
+
+       srd->fd = (int)get_arg0(regs);
+
        return 0;
 }
 
 static int ret_handler_sys_write(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
+       int ret = regs_return_value(regs);
+
+       if (ret > 0) {
+               struct energy_data *ed;
+               struct sys_read_data *srd;
+
+               srd = (struct sys_read_data *)ri->data;
+               ed = get_and_check_energy_data(srd->fd);
+               if (ed) {
+                       spin_lock(&ed->sys_write_lock);
+                       ed->sys_write_byte += ret;
+                       spin_unlock(&ed->sys_write_lock);
+               }
+       }
+
        return 0;
 }
 
 static struct kretprobe sys_write_krp = {
        .entry_handler = entry_handler_sys_write,
        .handler = ret_handler_sys_write,
+       .data_size = sizeof(struct sys_read_data)
 };
 
 
@@ -125,6 +352,7 @@ EXPORT_SYMBOL_GPL(unset_energy);
 
 static int __init swap_energy_init(void)
 {
+       int ret;
        unsigned long addr;
        addr = swap_ksyms("__switch_to");
        if (addr == 0) {
@@ -147,11 +375,14 @@ static int __init swap_energy_init(void)
        }
        sys_write_krp.kp.addr = (kprobe_opcode_t *)addr;
 
-       return 0;
+       ret = init_feature();
+
+       return ret;
 }
 
 static void __exit swap_energy_exit(void)
 {
+       uninit_feature();
 }
 
 module_init(swap_energy_init);