litmus-rt.git - The LITMUS^RT kernel.

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author	Bjoern B. Brandenburg <bbb@cs.unc.edu>	2011-02-12 16:40:43 -0500
committer	Bjoern B. Brandenburg <bbb@cs.unc.edu>	2011-04-12 21:39:15 -0400
commit	fa08f1949dadd0cbc4dcf71eb11dede76a8ad2ad (patch)
tree	2eb3a9e2afe8866f1e829e5e3a5ee2fda29cd0bf /kernel/freezer.c
parent	c05eaa8091d2cadc20363d44a85ee454262f4bc2 (diff)

bugfix: release master CPU must signal task was pickedwip-release-master-fix

Otherwise, the release master CPU may try to reschedule in an infinite loop.

Diffstat (limited to 'kernel/freezer.c')

0 files changed, 0 insertions, 0 deletions

/* * File...........: linux/drivers/s390/block/dasd_proc.c * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> * Horst Hummel <Horst.Hummel@de.ibm.com> * Carsten Otte <Cotte@de.ibm.com> * Martin Schwidefsky <schwidefsky@de.ibm.com> * Bugreports.to..: <Linux390@de.ibm.com> * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002 * * /proc interface for the dasd driver. * */ #define KMSG_COMPONENT "dasd" #include <linux/ctype.h> #include <linux/string.h> #include <linux/seq_file.h> #include <linux/vmalloc.h> #include <linux/proc_fs.h> #include <asm/debug.h> #include <asm/uaccess.h> /* This is ugly... */ #define PRINTK_HEADER "dasd_proc:" #include "dasd_int.h" static struct proc_dir_entry *dasd_proc_root_entry = NULL; static struct proc_dir_entry *dasd_devices_entry = NULL; static struct proc_dir_entry *dasd_statistics_entry = NULL; #ifdef CONFIG_DASD_PROFILE static char * dasd_get_user_string(const char __user *user_buf, size_t user_len) { char *buffer; buffer = kmalloc(user_len + 1, GFP_KERNEL); if (buffer == NULL) return ERR_PTR(-ENOMEM); if (copy_from_user(buffer, user_buf, user_len) != 0) { kfree(buffer); return ERR_PTR(-EFAULT); } /* got the string, now strip linefeed. */ if (buffer[user_len - 1] == '\n') buffer[user_len - 1] = 0; else buffer[user_len] = 0; return buffer; } #endif /* CONFIG_DASD_PROFILE */ static int dasd_devices_show(struct seq_file *m, void *v) { struct dasd_device *device; struct dasd_block *block; char *substr; device = dasd_device_from_devindex((unsigned long) v - 1); if (IS_ERR(device)) return 0; if (device->block) block = device->block; else { dasd_put_device(device); return 0; } /* Print device number. */ seq_printf(m, "%s", dev_name(&device->cdev->dev)); /* Print discipline string. */ if (device != NULL && device->discipline != NULL) seq_printf(m, "(%s)", device->discipline->name); else seq_printf(m, "(none)"); /* Print kdev. */ if (block->gdp) seq_printf(m, " at (%3d:%6d)", MAJOR(disk_devt(block->gdp)), MINOR(disk_devt(block->gdp))); else seq_printf(m, " at (???:??????)"); /* Print device name. */ if (block->gdp) seq_printf(m, " is %-8s", block->gdp->disk_name); else seq_printf(m, " is ????????"); /* Print devices features. */ substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; seq_printf(m, "%4s: ", substr); /* Print device status information. */ switch ((device != NULL) ? device->state : -1) { case -1: seq_printf(m, "unknown"); break; case DASD_STATE_NEW: seq_printf(m, "new"); break; case DASD_STATE_KNOWN: seq_printf(m, "detected"); break; case DASD_STATE_BASIC: seq_printf(m, "basic"); break; case DASD_STATE_UNFMT: seq_printf(m, "unformatted"); break; case DASD_STATE_READY: case DASD_STATE_ONLINE: seq_printf(m, "active "); if (dasd_check_blocksize(block->bp_block)) seq_printf(m, "n/f "); else seq_printf(m, "at blocksize: %d, %lld blocks, %lld MB", block->bp_block, block->blocks, ((block->bp_block >> 9) * block->blocks) >> 11); break; default: seq_printf(m, "no stat"); break; } dasd_put_device(device); if (dasd_probeonly) seq_printf(m, "(probeonly)"); seq_printf(m, "\n"); return 0; } static void *dasd_devices_start(struct seq_file *m, loff_t *pos) { if (*pos >= dasd_max_devindex) return NULL; return (void *)((unsigned long) *pos + 1); } static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) { ++*pos; return dasd_devices_start(m, pos); } static void dasd_devices_stop(struct seq_file *m, void *v) { } static const struct seq_operations dasd_devices_seq_ops = { .start = dasd_devices_start, .next = dasd_devices_next, .stop = dasd_devices_stop, .show = dasd_devices_show, }; static int dasd_devices_open(struct inode *inode, struct file *file) { return seq_open(file, &dasd_devices_seq_ops); } static const struct file_operations dasd_devices_file_ops = { .owner = THIS_MODULE, .open = dasd_devices_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; static int dasd_calc_metrics(char *page, char **start, off_t off, int count, int *eof, int len) { len = (len > off) ? len - off : 0; if (len > count) len = count; if (len < count) *eof = 1; *start = page + off; return len; } #ifdef CONFIG_DASD_PROFILE static char * dasd_statistics_array(char *str, unsigned int *array, int factor) { int i; for (i = 0; i < 32; i++) { str += sprintf(str, "%7d ", array[i] / factor); if (i == 15) str += sprintf(str, "\n"); } str += sprintf(str,"\n"); return str; } #endif /* CONFIG_DASD_PROFILE */ static int dasd_statistics_read(char *page, char **start, off_t off, int count, int *eof, void *data) { unsigned long len; #ifdef CONFIG_DASD_PROFILE struct dasd_profile_info_t *prof; char *str; int factor; /* check for active profiling */ if (dasd_profile_level == DASD_PROFILE_OFF) { len = sprintf(page, "Statistics are off - they might be " "switched on using 'echo set on > " "/proc/dasd/statistics'\n"); return dasd_calc_metrics(page, start, off, count, eof, len); } prof = &dasd_global_profile; /* prevent counter 'overflow' on output */ for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; factor *= 10); str = page; str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); str += sprintf(str, "with %u sectors(512B each)\n", prof->dasd_io_sects); str += sprintf(str, "Scale Factor is %d\n", factor); str += sprintf(str, " __<4 ___8 __16 __32 __64 _128 " " _256 _512 __1k __2k __4k __8k " " _16k _32k _64k 128k\n"); str += sprintf(str, " _256 _512 __1M __2M __4M __8M " " _16M _32M _64M 128M 256M 512M " " __1G __2G __4G " " _>4G\n"); str += sprintf(str, "Histogram of sizes (512B secs)\n"); str = dasd_statistics_array(str, prof->dasd_io_secs, factor); str += sprintf(str, "Histogram of I/O times (microseconds)\n"); str = dasd_statistics_array(str, prof->dasd_io_times, factor); str += sprintf(str, "Histogram of I/O times per sector\n"); str = dasd_statistics_array(str, prof->dasd_io_timps, factor); str += sprintf(str, "Histogram of I/O time till ssch\n"); str = dasd_statistics_array(str, prof->dasd_io_time1, factor); str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); str = dasd_statistics_array(str, prof->dasd_io_time2, factor); str += sprintf(str, "Histogram of I/O time between ssch " "and irq per sector\n"); str = dasd_statistics_array(str, prof->dasd_io_time2ps, factor); str += sprintf(str, "Histogram of I/O time between irq and end\n"); str = dasd_statistics_array(str, prof->dasd_io_time3, factor); str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); str = dasd_statistics_array(str, prof->dasd_io_nr_req, factor);


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