The branch main has been updated by cperciva:
URL:
https://cgit.FreeBSD.org/src/commit/?id=40b287054521f0a92e5ae9a26e6a87d17ee85eea
commit 40b287054521f0a92e5ae9a26e6a87d17ee85eea
Author: Colin Percival <cperc...@freebsd.org>
AuthorDate: 2023-05-19 13:46:42 +0000
Commit: Colin Percival <cperc...@freebsd.org>
CommitDate: 2023-05-19 13:46:42 +0000
mi_startup: Instrument the bubblesort with TSLOG
The bubblesort of SYSINITs is currently responsible for 7% of the
kernel boot time when booting a 1 CPU / 128 MB VM under Firecracker.
It needs to be replaced with a faster sort, but until that happens
at least instrumenting it with TSLOG makes it show up in flamecharts.
---
sys/kern/init_main.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 1974c4e68ce4..e4cb501bc57b 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -255,6 +255,7 @@ restart:
* Perform a bubble sort of the system initialization objects by
* their subsystem (primary key) and order (secondary key).
*/
+ TSENTER2("bubblesort");
for (sipp = sysinit; sipp < sysinit_end; sipp++) {
for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
if ((*sipp)->subsystem < (*xipp)->subsystem ||
@@ -266,6 +267,7 @@ restart:
*xipp = save;
}
}
+ TSEXIT2("bubblesort");
last = SI_SUB_COPYRIGHT;
#if defined(VERBOSE_SYSINIT)
