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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>
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Jeremy Fitzhardinge
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Ingo Molnar
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Aug 21, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| #include <linux/init.h> | ||
| #include <linux/debugfs.h> | ||
| #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) | ||
| { | ||
| if (!d_xen_debug) { | ||
| d_xen_debug = debugfs_create_dir("xen", NULL); | ||
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| if (!d_xen_debug) | ||
| pr_warning("Could not create 'xen' debugfs directory\n"); | ||
| } | ||
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| return d_xen_debug; | ||
| } | ||
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| struct array_data | ||
| { | ||
| void *array; | ||
| unsigned elements; | ||
| }; | ||
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| static int u32_array_open(struct inode *inode, struct file *file) | ||
| { | ||
| file->private_data = NULL; | ||
| return nonseekable_open(inode, file); | ||
| } | ||
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| static size_t format_array(char *buf, size_t bufsize, const char *fmt, | ||
| u32 *array, unsigned array_size) | ||
| { | ||
| size_t ret = 0; | ||
| unsigned i; | ||
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| for(i = 0; i < array_size; i++) { | ||
| size_t len; | ||
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| len = snprintf(buf, bufsize, fmt, array[i]); | ||
| len++; /* ' ' or '\n' */ | ||
| ret += len; | ||
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| if (buf) { | ||
| buf += len; | ||
| bufsize -= len; | ||
| buf[-1] = (i == array_size-1) ? '\n' : ' '; | ||
| } | ||
| } | ||
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| ret++; /* \0 */ | ||
| if (buf) | ||
| *buf = '\0'; | ||
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| return ret; | ||
| } | ||
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| static char *format_array_alloc(const char *fmt, u32 *array, unsigned array_size) | ||
| { | ||
| size_t len = format_array(NULL, 0, fmt, array, array_size); | ||
| char *ret; | ||
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| ret = kmalloc(len, GFP_KERNEL); | ||
| if (ret == NULL) | ||
| return NULL; | ||
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| format_array(ret, len, fmt, array, array_size); | ||
| return ret; | ||
| } | ||
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| static ssize_t u32_array_read(struct file *file, char __user *buf, size_t len, | ||
| loff_t *ppos) | ||
| { | ||
| struct inode *inode = file->f_path.dentry->d_inode; | ||
| struct array_data *data = inode->i_private; | ||
| size_t size; | ||
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| if (*ppos == 0) { | ||
| if (file->private_data) { | ||
| kfree(file->private_data); | ||
| file->private_data = NULL; | ||
| } | ||
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| file->private_data = format_array_alloc("%u", data->array, data->elements); | ||
| } | ||
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| size = 0; | ||
| if (file->private_data) | ||
| 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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| static int xen_array_release(struct inode *inode, struct file *file) | ||
| { | ||
| kfree(file->private_data); | ||
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| return 0; | ||
| } | ||
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| static struct file_operations u32_array_fops = { | ||
| .owner = THIS_MODULE, | ||
| .open = u32_array_open, | ||
| .release= xen_array_release, | ||
| .read = u32_array_read, | ||
| }; | ||
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| struct dentry *xen_debugfs_create_u32_array(const char *name, mode_t mode, | ||
| struct dentry *parent, | ||
| u32 *array, unsigned elements) | ||
| { | ||
| struct array_data *data = kmalloc(sizeof(*data), GFP_KERNEL); | ||
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| if (data == NULL) | ||
| return NULL; | ||
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| data->array = array; | ||
| data->elements = elements; | ||
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| return debugfs_create_file(name, mode, parent, data, &u32_array_fops); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| #ifndef _XEN_DEBUGFS_H | ||
| #define _XEN_DEBUGFS_H | ||
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| struct dentry * __init xen_init_debugfs(void); | ||
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| struct dentry *xen_debugfs_create_u32_array(const char *name, mode_t mode, | ||
| struct dentry *parent, | ||
| u32 *array, unsigned elements); | ||
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| #endif /* _XEN_DEBUGFS_H */ |
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