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Commit 21783c97 authored by Mikael Starvik's avatar Mikael Starvik Committed by Linus Torvalds
Browse files

[PATCH] CRIS update: profiler 



System-level profiler.

Signed-off-by: default avatarMikael Starvik <starvik@axis.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 59c61138

arch/cris/kernel/profile.c

0 → 100644
+73 −0
Original line number Diff line number Diff line 
#include <linux/init.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/proc_fs.h>

#include <linux/types.h>

#include <asm/ptrace.h>

#include <asm/uaccess.h>



#define SAMPLE_BUFFER_SIZE 8192



static char* sample_buffer;

static char* sample_buffer_pos;

static int prof_running = 0;



void

cris_profile_sample(struct pt_regs* regs)

{

  if (!prof_running)

    return;

  if (user_mode(regs))

    *(unsigned int*)sample_buffer_pos = current->pid;

  else

    *(unsigned int*)sample_buffer_pos = 0;

  *(unsigned int*)(sample_buffer_pos + 4) = instruction_pointer(regs);

  sample_buffer_pos += 8;

  if (sample_buffer_pos == sample_buffer + SAMPLE_BUFFER_SIZE)

    sample_buffer_pos = sample_buffer;

}



static ssize_t

read_cris_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)

{

  unsigned long p = *ppos;

  if (p > SAMPLE_BUFFER_SIZE)

    return 0;

  if (p + count > SAMPLE_BUFFER_SIZE)

    count = SAMPLE_BUFFER_SIZE - p;

  if (copy_to_user(buf, sample_buffer + p,count))

		return -EFAULT;

  memset(sample_buffer + p, 0, count);

  *ppos += count;

  return count;

}



static ssize_t

write_cris_profile(struct file *file, const char __user *buf,

              size_t count, loff_t *ppos)

{

  sample_buffer_pos = sample_buffer;

  memset(sample_buffer, 0, SAMPLE_BUFFER_SIZE);

}



static struct file_operations cris_proc_profile_operations = {

	.read		= read_cris_profile,

	.write		= write_cris_profile,

};



static int

__init init_cris_profile(void)

{

  struct proc_dir_entry *entry;

  sample_buffer = (char*)kmalloc(SAMPLE_BUFFER_SIZE, GFP_KERNEL);

  sample_buffer_pos = sample_buffer;

  entry = create_proc_entry("system_profile", S_IWUSR | S_IRUGO, NULL);

  if (entry) {

    entry->proc_fops = &cris_proc_profile_operations;

    entry->size = SAMPLE_BUFFER_SIZE;

  }

  prof_running = 1;

  return 0;

}



__initcall(init_cris_profile);

arch/cris/kernel/time.c

+17 −1
Original line number Diff line number Diff line 
/* $Id: time.c,v 1.14 2004/06/01 05:38:11 starvik Exp $

/* $Id: time.c,v 1.18 2005/03/04 08:16:17 starvik Exp $

 *

 *  linux/arch/cris/kernel/time.c

 *
@@ -30,6 +30,7 @@ 
#include <linux/bcd.h>

#include <linux/timex.h>

#include <linux/init.h>

#include <linux/profile.h>



u64 jiffies_64 = INITIAL_JIFFIES;
@@ -214,6 +215,21 @@ update_xtime_from_cmos(void) 
	}

}



extern void cris_profile_sample(struct pt_regs* regs);



void

cris_do_profile(struct pt_regs* regs)

{



#if CONFIG_SYSTEM_PROFILER

        cris_profile_sample(regs);

#endif



#if CONFIG_PROFILING

        profile_tick(CPU_PROFILING, regs);

#endif

}



/*

 * Scheduler clock - returns current time in nanosec units.

 */

include/asm-cris/ptrace.h

+2 −0
Original line number Diff line number Diff line
@@ -9,4 +9,6 @@ 
#define PTRACE_SETREGS            13

#endif



#define profile_pc(regs) instruction_pointer(regs)



#endif /* _CRIS_PTRACE_H */