diff options
Diffstat (limited to 'block/genhd.c')
| -rw-r--r-- | block/genhd.c | 102 |
1 files changed, 70 insertions, 32 deletions
diff --git a/block/genhd.c b/block/genhd.c index f7d60b620b97..9eb981f7e5a4 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -92,6 +92,34 @@ const char *bdevname(struct block_device *bdev, char *buf) } EXPORT_SYMBOL(bdevname); +#ifdef CONFIG_SMP +static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat) +{ + int cpu; + + memset(stat, 0, sizeof(struct disk_stats)); + for_each_possible_cpu(cpu) { + struct disk_stats *ptr = per_cpu_ptr(part->dkstats, cpu); + int group; + + for (group = 0; group < NR_STAT_GROUPS; group++) { + stat->nsecs[group] += ptr->nsecs[group]; + stat->sectors[group] += ptr->sectors[group]; + stat->ios[group] += ptr->ios[group]; + stat->merges[group] += ptr->merges[group]; + } + + stat->io_ticks += ptr->io_ticks; + stat->time_in_queue += ptr->time_in_queue; + } +} +#else /* CONFIG_SMP */ +static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat) +{ + memcpy(stat, &part->dkstats, sizeof(struct disk_stats)); +} +#endif /* CONFIG_SMP */ + void part_inc_in_flight(struct request_queue *q, struct hd_struct *part, int rw) { if (queue_is_mq(q)) @@ -1214,9 +1242,12 @@ ssize_t part_stat_show(struct device *dev, { struct hd_struct *p = dev_to_part(dev); struct request_queue *q = part_to_disk(p)->queue; + struct disk_stats stat; unsigned int inflight; + part_stat_read_all(p, &stat); inflight = part_in_flight(q, p); + return sprintf(buf, "%8lu %8lu %8llu %8u " "%8lu %8lu %8llu %8u " @@ -1224,23 +1255,23 @@ ssize_t part_stat_show(struct device *dev, "%8lu %8lu %8llu %8u " "%8lu %8u" "\n", - part_stat_read(p, ios[STAT_READ]), - part_stat_read(p, merges[STAT_READ]), - (unsigned long long)part_stat_read(p, sectors[STAT_READ]), - (unsigned int)part_stat_read_msecs(p, STAT_READ), - part_stat_read(p, ios[STAT_WRITE]), - part_stat_read(p, merges[STAT_WRITE]), - (unsigned long long)part_stat_read(p, sectors[STAT_WRITE]), - (unsigned int)part_stat_read_msecs(p, STAT_WRITE), + stat.ios[STAT_READ], + stat.merges[STAT_READ], + (unsigned long long)stat.sectors[STAT_READ], + (unsigned int)div_u64(stat.nsecs[STAT_READ], NSEC_PER_MSEC), + stat.ios[STAT_WRITE], + stat.merges[STAT_WRITE], + (unsigned long long)stat.sectors[STAT_WRITE], + (unsigned int)div_u64(stat.nsecs[STAT_WRITE], NSEC_PER_MSEC), inflight, - jiffies_to_msecs(part_stat_read(p, io_ticks)), - jiffies_to_msecs(part_stat_read(p, time_in_queue)), - part_stat_read(p, ios[STAT_DISCARD]), - part_stat_read(p, merges[STAT_DISCARD]), - (unsigned long long)part_stat_read(p, sectors[STAT_DISCARD]), - (unsigned int)part_stat_read_msecs(p, STAT_DISCARD), - part_stat_read(p, ios[STAT_FLUSH]), - (unsigned int)part_stat_read_msecs(p, STAT_FLUSH)); + jiffies_to_msecs(stat.io_ticks), + jiffies_to_msecs(stat.time_in_queue), + stat.ios[STAT_DISCARD], + stat.merges[STAT_DISCARD], + (unsigned long long)stat.sectors[STAT_DISCARD], + (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], NSEC_PER_MSEC), + stat.ios[STAT_FLUSH], + (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC)); } ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, @@ -1492,6 +1523,7 @@ static int diskstats_show(struct seq_file *seqf, void *v) struct hd_struct *hd; char buf[BDEVNAME_SIZE]; unsigned int inflight; + struct disk_stats stat; /* if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) @@ -1503,7 +1535,9 @@ static int diskstats_show(struct seq_file *seqf, void *v) disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); while ((hd = disk_part_iter_next(&piter))) { + part_stat_read_all(hd, &stat); inflight = part_in_flight(gp->queue, hd); + seq_printf(seqf, "%4d %7d %s " "%lu %lu %lu %u " "%lu %lu %lu %u " @@ -1513,23 +1547,27 @@ static int diskstats_show(struct seq_file *seqf, void *v) "\n", MAJOR(part_devt(hd)), MINOR(part_devt(hd)), disk_name(gp, hd->partno, buf), - part_stat_read(hd, ios[STAT_READ]), - part_stat_read(hd, merges[STAT_READ]), - part_stat_read(hd, sectors[STAT_READ]), - (unsigned int)part_stat_read_msecs(hd, STAT_READ), - part_stat_read(hd, ios[STAT_WRITE]), - part_stat_read(hd, merges[STAT_WRITE]), - part_stat_read(hd, sectors[STAT_WRITE]), - (unsigned int)part_stat_read_msecs(hd, STAT_WRITE), + stat.ios[STAT_READ], + stat.merges[STAT_READ], + stat.sectors[STAT_READ], + (unsigned int)div_u64(stat.nsecs[STAT_READ], + NSEC_PER_MSEC), + stat.ios[STAT_WRITE], + stat.merges[STAT_WRITE], + stat.sectors[STAT_WRITE], + (unsigned int)div_u64(stat.nsecs[STAT_WRITE], + NSEC_PER_MSEC), inflight, - jiffies_to_msecs(part_stat_read(hd, io_ticks)), - jiffies_to_msecs(part_stat_read(hd, time_in_queue)), - part_stat_read(hd, ios[STAT_DISCARD]), - part_stat_read(hd, merges[STAT_DISCARD]), - part_stat_read(hd, sectors[STAT_DISCARD]), - (unsigned int)part_stat_read_msecs(hd, STAT_DISCARD), - part_stat_read(hd, ios[STAT_FLUSH]), - (unsigned int)part_stat_read_msecs(hd, STAT_FLUSH) + jiffies_to_msecs(stat.io_ticks), + jiffies_to_msecs(stat.time_in_queue), + stat.ios[STAT_DISCARD], + stat.merges[STAT_DISCARD], + stat.sectors[STAT_DISCARD], + (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], + NSEC_PER_MSEC), + stat.ios[STAT_FLUSH], + (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], + NSEC_PER_MSEC) ); } disk_part_iter_exit(&piter); |