994025caba
Add support for exporting statistics on mmu updates, multicall batching and pv spinlocks into debugfs. The base path is xen/ and each subsystem adds its own directory: mmu, multicalls, spinlocks. In each directory, writing 1 to "zero_stats" will cause the corresponding stats to be zeroed the next time they're updated. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
123 lines
2.4 KiB
C
123 lines
2.4 KiB
C
#include <linux/init.h>
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include "debugfs.h"
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static struct dentry *d_xen_debug;
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struct dentry * __init xen_init_debugfs(void)
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{
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if (!d_xen_debug) {
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d_xen_debug = debugfs_create_dir("xen", NULL);
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if (!d_xen_debug)
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pr_warning("Could not create 'xen' debugfs directory\n");
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}
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return d_xen_debug;
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}
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struct array_data
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{
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void *array;
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unsigned elements;
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};
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static int u32_array_open(struct inode *inode, struct file *file)
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{
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file->private_data = NULL;
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return nonseekable_open(inode, file);
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}
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static size_t format_array(char *buf, size_t bufsize, const char *fmt,
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u32 *array, unsigned array_size)
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{
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size_t ret = 0;
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unsigned i;
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for(i = 0; i < array_size; i++) {
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size_t len;
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len = snprintf(buf, bufsize, fmt, array[i]);
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len++; /* ' ' or '\n' */
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ret += len;
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if (buf) {
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buf += len;
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bufsize -= len;
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buf[-1] = (i == array_size-1) ? '\n' : ' ';
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}
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}
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ret++; /* \0 */
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if (buf)
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*buf = '\0';
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return ret;
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}
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static char *format_array_alloc(const char *fmt, u32 *array, unsigned array_size)
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{
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size_t len = format_array(NULL, 0, fmt, array, array_size);
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char *ret;
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ret = kmalloc(len, GFP_KERNEL);
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if (ret == NULL)
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return NULL;
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format_array(ret, len, fmt, array, array_size);
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return ret;
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}
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static ssize_t u32_array_read(struct file *file, char __user *buf, size_t len,
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loff_t *ppos)
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{
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struct inode *inode = file->f_path.dentry->d_inode;
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struct array_data *data = inode->i_private;
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size_t size;
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if (*ppos == 0) {
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if (file->private_data) {
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kfree(file->private_data);
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file->private_data = NULL;
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}
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file->private_data = format_array_alloc("%u", data->array, data->elements);
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}
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size = 0;
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if (file->private_data)
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size = strlen(file->private_data);
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return simple_read_from_buffer(buf, len, ppos, file->private_data, size);
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}
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static int xen_array_release(struct inode *inode, struct file *file)
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{
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kfree(file->private_data);
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return 0;
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}
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static struct file_operations u32_array_fops = {
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.owner = THIS_MODULE,
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.open = u32_array_open,
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.release= xen_array_release,
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.read = u32_array_read,
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};
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struct dentry *xen_debugfs_create_u32_array(const char *name, mode_t mode,
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struct dentry *parent,
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u32 *array, unsigned elements)
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{
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struct array_data *data = kmalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL)
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return NULL;
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data->array = array;
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data->elements = elements;
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return debugfs_create_file(name, mode, parent, data, &u32_array_fops);
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}
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