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| author |   David Wang <00107082@163.com> | 2024-11-06 10:12:28 +0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2024-11-07 07:40:14 -1000 |
| commit | 84b9749a3a704dcc824a88aa8267247c801d51e4 (patch) | |
| tree | c88f60eb72742cb5a17e741a7ddf29d59f7a24d0 /fs/proc/softirqs.c | |
| parent | Merge tag 'nfs-for-6.12-3' of git://git.linux-nfs.org/projects/anna/linux-nfs (diff) | |
| download | wireguard-linux-84b9749a3a704dcc824a88aa8267247c801d51e4.tar.xz wireguard-linux-84b9749a3a704dcc824a88aa8267247c801d51e4.zip | |
proc/softirqs: replace seq_printf with seq_put_decimal_ull_width
seq_printf is costy, on a system with n CPUs, reading /proc/softirqs
would yield 10*n decimal values, and the extra cost parsing format string
grows linearly with number of cpus. Replace seq_printf with
seq_put_decimal_ull_width have significant performance improvement.
On an 8CPUs system, reading /proc/softirqs show ~40% performance
gain with this patch.
Signed-off-by: David Wang <00107082@163.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
| -rw-r--r-- | fs/proc/softirqs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/softirqs.c b/fs/proc/softirqs.c index f4616083faef..04bb29721419 100644 --- a/fs/proc/softirqs.c +++ b/fs/proc/softirqs.c @@ -20,7 +20,7 @@ static int show_softirqs(struct seq_file *p, void *v) for (i = 0; i < NR_SOFTIRQS; i++) { seq_printf(p, "%12s:", softirq_to_name[i]); for_each_possible_cpu(j) - seq_printf(p, " %10u", kstat_softirqs_cpu(i, j)); + seq_put_decimal_ull_width(p, " ", kstat_softirqs_cpu(i, j), 10); seq_putc(p, '\n'); } return 0; |