forked from Minki/linux
oprofile: set values to default when creating oprofilefs
This patch restores default values for: /dev/oprofile/cpu_buffer_size /dev/oprofile/buffer_watershed /dev/oprofile/buffer_size when creating the oprofilefs: # opcontrol --deinit # opcontrol --init # cat /dev/oprofile/cpu_buffer_size 8192 # echo 5123 > /dev/oprofile/cpu_buffer_size # cat /dev/oprofile/cpu_buffer_size 5123 # opcontrol --deinit # opcontrol --init # cat /dev/oprofile/cpu_buffer_size 8192 # opcontrol --deinit This sets the values in a defined state. Before, there was no way to restore the defaults without rebooting the system or reloading the module. Signed-off-by: Robert Richter <robert.richter@amd.com>
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@ -14,9 +14,13 @@
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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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#define FS_BUFFER_SIZE_DEFAULT 131072
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#define FS_CPU_BUFFER_SIZE_DEFAULT 8192
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#define FS_BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */
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unsigned long fs_buffer_size;
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unsigned long fs_cpu_buffer_size;
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unsigned long fs_buffer_watershed;
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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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@ -120,6 +124,11 @@ static const struct file_operations dump_fops = {
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void oprofile_create_files(struct super_block *sb, struct dentry *root)
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{
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/* reinitialize default values */
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fs_buffer_size = FS_BUFFER_SIZE_DEFAULT;
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fs_cpu_buffer_size = FS_CPU_BUFFER_SIZE_DEFAULT;
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fs_buffer_watershed = FS_BUFFER_WATERSHED_DEFAULT;
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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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