1a960b402a
This patch introduces multiplexing support for the Oprofile kernel module. It basically adds a new function pointer in oprofile_operator allowing each architecture to supply its callback to switch between different sets of event when the timer expires. Userspace tools can modify the time slice through /dev/oprofile/time_slice. It also modifies the number of counters exposed to the userspace through /dev/oprofile. For example, the number of counters for AMD CPUs are changed to 32 and multiplexed in the sets of 4. Signed-off-by: Jason Yeh <jason.yeh@amd.com> Signed-off-by: Robert Richter <robert.richter@amd.com> Cc: oprofile-list <oprofile-list@lists.sourceforge.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
171 lines
3.9 KiB
C
171 lines
3.9 KiB
C
/**
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* @file oprofile_files.c
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*
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* @remark Copyright 2002 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon <levon@movementarian.org>
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*/
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#include <linux/fs.h>
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#include <linux/oprofile.h>
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#include <linux/jiffies.h>
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#include "event_buffer.h"
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#include "oprofile_stats.h"
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#include "oprof.h"
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unsigned long fs_buffer_size = 131072;
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unsigned long fs_cpu_buffer_size = 8192;
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unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */
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static ssize_t timeout_read(struct file *file, char __user *buf,
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size_t count, loff_t *offset)
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{
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return oprofilefs_ulong_to_user(jiffies_to_msecs(timeout_jiffies),
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buf, count, offset);
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}
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static ssize_t timeout_write(struct file *file, char const __user *buf,
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size_t count, loff_t *offset)
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{
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unsigned long val;
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int retval;
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if (*offset)
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return -EINVAL;
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retval = oprofilefs_ulong_from_user(&val, buf, count);
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if (retval)
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return retval;
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retval = oprofile_set_timeout(val);
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if (retval)
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return retval;
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return count;
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}
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static const struct file_operations timeout_fops = {
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.read = timeout_read,
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.write = timeout_write,
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};
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static ssize_t depth_read(struct file * file, char __user * buf, size_t count, loff_t * offset)
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{
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return oprofilefs_ulong_to_user(backtrace_depth, buf, count, offset);
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}
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static ssize_t depth_write(struct file * file, char const __user * buf, size_t count, loff_t * offset)
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{
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unsigned long val;
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int retval;
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if (*offset)
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return -EINVAL;
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retval = oprofilefs_ulong_from_user(&val, buf, count);
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if (retval)
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return retval;
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retval = oprofile_set_backtrace(val);
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if (retval)
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return retval;
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return count;
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}
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static const struct file_operations depth_fops = {
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.read = depth_read,
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.write = depth_write
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};
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static ssize_t pointer_size_read(struct file * file, char __user * buf, size_t count, loff_t * offset)
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{
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return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
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}
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static const struct file_operations pointer_size_fops = {
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.read = pointer_size_read,
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};
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static ssize_t cpu_type_read(struct file * file, char __user * buf, size_t count, loff_t * offset)
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{
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return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
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}
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static const struct file_operations cpu_type_fops = {
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.read = cpu_type_read,
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};
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static ssize_t enable_read(struct file * file, char __user * buf, size_t count, loff_t * offset)
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{
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return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
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}
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static ssize_t enable_write(struct file * file, char const __user * buf, size_t count, loff_t * offset)
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{
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unsigned long val;
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int retval;
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if (*offset)
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return -EINVAL;
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retval = oprofilefs_ulong_from_user(&val, buf, count);
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if (retval)
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return retval;
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if (val)
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retval = oprofile_start();
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else
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oprofile_stop();
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if (retval)
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return retval;
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return count;
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}
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static const struct file_operations enable_fops = {
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.read = enable_read,
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.write = enable_write,
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};
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static ssize_t dump_write(struct file * file, char const __user * buf, size_t count, loff_t * offset)
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{
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wake_up_buffer_waiter();
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return count;
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}
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static const struct file_operations dump_fops = {
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.write = dump_write,
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};
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void oprofile_create_files(struct super_block * sb, struct dentry * root)
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{
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oprofilefs_create_file(sb, root, "enable", &enable_fops);
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oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
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oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
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oprofilefs_create_ulong(sb, root, "buffer_size", &fs_buffer_size);
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oprofilefs_create_ulong(sb, root, "buffer_watershed", &fs_buffer_watershed);
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oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &fs_cpu_buffer_size);
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oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
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oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
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oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
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oprofilefs_create_file(sb, root, "timeout_ms", &timeout_fops);
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oprofile_create_stats_files(sb, root);
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if (oprofile_ops.create_files)
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oprofile_ops.create_files(sb, root);
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}
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