https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 39a8804455fb23f09157341d3ba7db6d7ae6ee76 authored by Linus Torvalds on 12 April 2015, 22:12:50 UTC
Linux 4.0
Linux 4.0
Tip revision: 39a8804
profile.c
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/slab.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;
ssize_t ret;
ret = simple_read_from_buffer(buf, count, ppos, sample_buffer,
SAMPLE_BUFFER_SIZE);
if (ret < 0)
return ret;
memset(sample_buffer + p, 0, ret);
return ret;
}
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);
return count < SAMPLE_BUFFER_SIZE ? count : SAMPLE_BUFFER_SIZE;
}
static const struct file_operations cris_proc_profile_operations = {
.read = read_cris_profile,
.write = write_cris_profile,
.llseek = default_llseek,
};
static int __init init_cris_profile(void)
{
struct proc_dir_entry *entry;
sample_buffer = kmalloc(SAMPLE_BUFFER_SIZE, GFP_KERNEL);
if (!sample_buffer) {
return -ENOMEM;
}
sample_buffer_pos = sample_buffer;
entry = proc_create("system_profile", S_IWUSR | S_IRUGO, NULL,
&cris_proc_profile_operations);
if (entry) {
proc_set_size(entry, SAMPLE_BUFFER_SIZE);
}
prof_running = 1;
return 0;
}
__initcall(init_cris_profile);