linux-kernel - [PATCH] block:genhd:/proc/diskstats: use seq_put_decimal

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Message-Id: <20241108054500.4251-1-00107082@163.com>
Date: Fri,  8 Nov 2024 13:45:00 +0800
From: David Wang <00107082@....com>
To: axboe@...nel.dk
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	David Wang <00107082@....com>
Subject: [PATCH] block:genhd:/proc/diskstats: use seq_put_decimal_ull for decimal values

seq_printf is costy, for each block device, 19 decimal values are
yielded in /proc/diskstats via seq_printf; On a system with 16
logical block devices, profiling for open/read/close sequences
shows seq_printf took ~75% samples of diskstats_show:

	diskstats_show(92.626% 2269372/2450040)
	    seq_printf(76.026% 1725313/2269372)
		vsnprintf(99.163% 1710866/1725313)
		    format_decode(26.597% 455040/1710866)
		    number(19.554% 334542/1710866)
		    memcpy_orig(4.183% 71570/1710866)
			...
		srso_return_thunk(0.009% 148/1725313)
	    part_stat_read_all(8.030% 182236/2269372)

One million rounds of open/read/close /proc/diskstats takes:

	real	0m37.687s
	user	0m0.264s
	sys	0m32.911s
On average, each sequence tooks ~0.032ms

With this patch, most decimal values are yield via seq_put_decimal_ull,
performance is significantly improved:

	real	0m20.792s
	user	0m0.316s
	sys	0m20.463s
On average, each sequence tooks ~0.020ms, a ~37.5% improvement.

Signed-off-by: David Wang <00107082@....com>
---
 block/genhd.c | 63 ++++++++++++++++++++++++---------------------------
 1 file changed, 29 insertions(+), 34 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 1c05dd4c6980..72f481a82fa4 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1264,40 +1264,35 @@ static int diskstats_show(struct seq_file *seqf, void *v)
 			part_stat_unlock();
 		}
 		part_stat_read_all(hd, &stat);
-		seq_printf(seqf, "%4d %7d %pg "
-			   "%lu %lu %lu %u "
-			   "%lu %lu %lu %u "
-			   "%u %u %u "
-			   "%lu %lu %lu %u "
-			   "%lu %u"
-			   "\n",
-			   MAJOR(hd->bd_dev), MINOR(hd->bd_dev), hd,
-			   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(stat.io_ticks),
-			   (unsigned int)div_u64(stat.nsecs[STAT_READ] +
-						 stat.nsecs[STAT_WRITE] +
-						 stat.nsecs[STAT_DISCARD] +
-						 stat.nsecs[STAT_FLUSH],
-							NSEC_PER_MSEC),
-			   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)
-			);
+		seq_put_decimal_ull_width(seqf, "",  MAJOR(hd->bd_dev), 4);
+		seq_put_decimal_ull_width(seqf, " ", MINOR(hd->bd_dev), 7);
+		seq_printf(seqf, " %pg", hd);
+		seq_put_decimal_ull(seqf, " ", stat.ios[STAT_READ]);
+		seq_put_decimal_ull(seqf, " ", stat.merges[STAT_READ]);
+		seq_put_decimal_ull(seqf, " ", stat.sectors[STAT_READ]);
+		seq_put_decimal_ull(seqf, " ", (unsigned int)div_u64(stat.nsecs[STAT_READ],
+								     NSEC_PER_MSEC));
+		seq_put_decimal_ull(seqf, " ", stat.ios[STAT_WRITE]);
+		seq_put_decimal_ull(seqf, " ", stat.merges[STAT_WRITE]);
+		seq_put_decimal_ull(seqf, " ", stat.sectors[STAT_WRITE]);
+		seq_put_decimal_ull(seqf, " ", (unsigned int)div_u64(stat.nsecs[STAT_WRITE],
+								     NSEC_PER_MSEC));
+		seq_put_decimal_ull(seqf, " ", inflight);
+		seq_put_decimal_ull(seqf, " ", jiffies_to_msecs(stat.io_ticks));
+		seq_put_decimal_ull(seqf, " ", (unsigned int)div_u64(stat.nsecs[STAT_READ] +
+								     stat.nsecs[STAT_WRITE] +
+								     stat.nsecs[STAT_DISCARD] +
+								     stat.nsecs[STAT_FLUSH],
+								     NSEC_PER_MSEC));
+		seq_put_decimal_ull(seqf, " ", stat.ios[STAT_DISCARD]);
+		seq_put_decimal_ull(seqf, " ", stat.merges[STAT_DISCARD]);
+		seq_put_decimal_ull(seqf, " ", stat.sectors[STAT_DISCARD]);
+		seq_put_decimal_ull(seqf, " ", (unsigned int)div_u64(stat.nsecs[STAT_DISCARD],
+								     NSEC_PER_MSEC));
+		seq_put_decimal_ull(seqf, " ", stat.ios[STAT_FLUSH]);
+		seq_put_decimal_ull(seqf, " ", (unsigned int)div_u64(stat.nsecs[STAT_FLUSH],
+								     NSEC_PER_MSEC));
+		seq_putc(seqf, '\n');
 	}
 	rcu_read_unlock();
 
-- 
2.39.2