From 6765cc2ac60f124ffffd0232e095c5ec6eb70d57 Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Wed, 28 Jan 2015 19:06:29 +0100 Subject: [PATCH] s390/dasd: cleanup profiling The dasd driver has a lot of duplicated code to handle dasd_global_profile. With this patch we use the same code for the global and the per device profiling data. Note that dasd_stats_write had to change slightly to maintain some odd differences between A) per device and global profile and B) proc and sysfs interface usage. Signed-off-by: Sebastian Ott Reviewed-by: Stefan Haberland Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dasd.c | 90 ++++++---------------------------- drivers/s390/block/dasd_int.h | 1 - drivers/s390/block/dasd_proc.c | 21 +++++--- 3 files changed, 27 insertions(+), 85 deletions(-) diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index a67e8dae73c3..be34ef41b7c7 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -674,10 +674,7 @@ EXPORT_SYMBOL(dasd_enable_device); unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; #ifdef CONFIG_DASD_PROFILE -static struct dasd_profile_info dasd_global_profile_data; struct dasd_profile dasd_global_profile = { - .dentry = NULL, - .data = &dasd_global_profile_data, .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock), }; static struct dentry *dasd_debugfs_global_entry; @@ -701,7 +698,7 @@ static void dasd_profile_start(struct dasd_block *block, break; spin_lock(&dasd_global_profile.lock); - if (dasd_global_profile_level) { + if (dasd_global_profile.data) { dasd_global_profile.data->dasd_io_nr_req[counter]++; if (rq_data_dir(req) == READ) dasd_global_profile.data->dasd_read_nr_req[counter]++; @@ -832,7 +829,7 @@ static void dasd_profile_end(struct dasd_block *block, dasd_profile_counter(endtime, endtime_ind); spin_lock(&dasd_global_profile.lock); - if (dasd_global_profile_level) { + if (dasd_global_profile.data) { dasd_profile_end_add_data(dasd_global_profile.data, cqr->startdev != block->base, cqr->cpmode == 1, @@ -884,11 +881,6 @@ void dasd_profile_reset(struct dasd_profile *profile) spin_unlock_bh(&profile->lock); } -void dasd_global_profile_reset(void) -{ - dasd_profile_reset(&dasd_global_profile); -} - int dasd_profile_on(struct dasd_profile *profile) { struct dasd_profile_info *data; @@ -956,12 +948,20 @@ static ssize_t dasd_stats_write(struct file *file, dasd_profile_reset(prof); } else if (strncmp(str, "on", 2) == 0) { rc = dasd_profile_on(prof); - if (!rc) - rc = user_len; + if (rc) + goto out; + rc = user_len; + if (prof == &dasd_global_profile) { + dasd_profile_reset(prof); + dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; + } } else if (strncmp(str, "off", 3) == 0) { + if (prof == &dasd_global_profile) + dasd_global_profile_level = DASD_PROFILE_OFF; dasd_profile_off(prof); } else rc = -EINVAL; +out: vfree(buffer); return rc; } @@ -1051,59 +1051,6 @@ static const struct file_operations dasd_stats_raw_fops = { .write = dasd_stats_write, }; -static ssize_t dasd_stats_global_write(struct file *file, - const char __user *user_buf, - size_t user_len, loff_t *pos) -{ - char *buffer, *str; - ssize_t rc; - - if (user_len > 65536) - user_len = 65536; - buffer = dasd_get_user_string(user_buf, user_len); - if (IS_ERR(buffer)) - return PTR_ERR(buffer); - str = skip_spaces(buffer); - rc = user_len; - if (strncmp(str, "reset", 5) == 0) { - dasd_global_profile_reset(); - } else if (strncmp(str, "on", 2) == 0) { - dasd_global_profile_reset(); - dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; - } else if (strncmp(str, "off", 3) == 0) { - dasd_global_profile_level = DASD_PROFILE_OFF; - } else - rc = -EINVAL; - vfree(buffer); - return rc; -} - -static int dasd_stats_global_show(struct seq_file *m, void *v) -{ - if (!dasd_global_profile_level) { - seq_puts(m, "disabled\n"); - return 0; - } - spin_lock_bh(&dasd_global_profile.lock); - dasd_stats_seq_print(m, dasd_global_profile.data); - spin_unlock_bh(&dasd_global_profile.lock); - return 0; -} - -static int dasd_stats_global_open(struct inode *inode, struct file *file) -{ - return single_open(file, dasd_stats_global_show, NULL); -} - -static const struct file_operations dasd_stats_global_fops = { - .owner = THIS_MODULE, - .open = dasd_stats_global_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, - .write = dasd_stats_global_write, -}; - static void dasd_profile_init(struct dasd_profile *profile, struct dentry *base_dentry) { @@ -1132,19 +1079,16 @@ static void dasd_profile_exit(struct dasd_profile *profile) static void dasd_statistics_removeroot(void) { dasd_global_profile_level = DASD_PROFILE_OFF; - debugfs_remove(dasd_global_profile.dentry); - dasd_global_profile.dentry = NULL; + dasd_profile_exit(&dasd_global_profile); debugfs_remove(dasd_debugfs_global_entry); debugfs_remove(dasd_debugfs_root_entry); } static void dasd_statistics_createroot(void) { - umode_t mode; struct dentry *pde; dasd_debugfs_root_entry = NULL; - dasd_debugfs_global_entry = NULL; pde = debugfs_create_dir("dasd", NULL); if (!pde || IS_ERR(pde)) goto error; @@ -1153,13 +1097,7 @@ static void dasd_statistics_createroot(void) if (!pde || IS_ERR(pde)) goto error; dasd_debugfs_global_entry = pde; - - mode = (S_IRUSR | S_IWUSR | S_IFREG); - pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry, - NULL, &dasd_stats_global_fops); - if (!pde || IS_ERR(pde)) - goto error; - dasd_global_profile.dentry = pde; + dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry); return; error: diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index 91731fa05604..227e3dea3155 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -728,7 +728,6 @@ int dasd_device_is_ro(struct dasd_device *); void dasd_profile_reset(struct dasd_profile *); int dasd_profile_on(struct dasd_profile *); void dasd_profile_off(struct dasd_profile *); -void dasd_global_profile_reset(void); char *dasd_get_user_string(const char __user *, size_t); /* externals in dasd_devmap.c */ diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c index 76410084c48f..aa7bb2d1da81 100644 --- a/drivers/s390/block/dasd_proc.c +++ b/drivers/s390/block/dasd_proc.c @@ -212,15 +212,15 @@ static int dasd_stats_proc_show(struct seq_file *m, void *v) struct dasd_profile_info *prof; int factor; - /* check for active profiling */ - if (!dasd_global_profile_level) { + spin_lock_bh(&dasd_global_profile.lock); + prof = dasd_global_profile.data; + if (!prof) { + spin_unlock_bh(&dasd_global_profile.lock); seq_printf(m, "Statistics are off - they might be " "switched on using 'echo set on > " "/proc/dasd/statistics'\n"); return 0; } - spin_lock_bh(&dasd_global_profile.lock); - prof = dasd_global_profile.data; /* prevent counter 'overflow' on output */ for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; @@ -293,14 +293,19 @@ static ssize_t dasd_stats_proc_write(struct file *file, dasd_stats_all_block_off(); goto out_error; } - dasd_global_profile_reset(); + rc = dasd_profile_on(&dasd_global_profile); + if (rc) { + dasd_stats_all_block_off(); + goto out_error; + } + dasd_profile_reset(&dasd_global_profile); dasd_global_profile_level = DASD_PROFILE_ON; pr_info("The statistics feature has been switched " "on\n"); } else if (strcmp(str, "off") == 0) { - /* switch off and reset statistics profiling */ + /* switch off statistics profiling */ dasd_global_profile_level = DASD_PROFILE_OFF; - dasd_global_profile_reset(); + dasd_profile_off(&dasd_global_profile); dasd_stats_all_block_off(); pr_info("The statistics feature has been switched " "off\n"); @@ -308,7 +313,7 @@ static ssize_t dasd_stats_proc_write(struct file *file, goto out_parse_error; } else if (strncmp(str, "reset", 5) == 0) { /* reset the statistics */ - dasd_global_profile_reset(); + dasd_profile_reset(&dasd_global_profile); dasd_stats_all_block_reset(); pr_info("The statistics have been reset\n"); } else -- 2.20.1