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| author | David Wang <00107082@163.com> | 2024-11-06 05:12:28 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-11-07 20:40:14 +0300 |
| commit | 84b9749a3a704dcc824a88aa8267247c801d51e4 (patch) | |
| tree | c88f60eb72742cb5a17e741a7ddf29d59f7a24d0 /tools/perf/scripts/python/flamegraph.py | |
| parent | ff7afaeca1a15fbeaa2c4795ee806c0667bd77b2 (diff) | |
| download | linux-84b9749a3a704dcc824a88aa8267247c801d51e4.tar.xz | |
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 'tools/perf/scripts/python/flamegraph.py')
0 files changed, 0 insertions, 0 deletions