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| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2022-09-30 12:27:12 +0200 |
|---|---|---|
| committer | Vlastimil Babka <vbabka@suse.cz> | 2022-10-24 12:19:06 +0200 |
| commit | 1a5ad30b89b4e9fa64f75b941a324396738b7616 (patch) | |
| tree | bb77c4ccbd699cacb1756ebc2243d76f68801d70 | |
| parent | mm: slub: remove dead and buggy code from sysfs_slab_add() (diff) | |
| download | linux-1a5ad30b89b4e9fa64f75b941a324396738b7616.tar.xz linux-1a5ad30b89b4e9fa64f75b941a324396738b7616.zip | |
mm: slub: make slab_sysfs_init() a late_initcall
Currently, slab_sysfs_init() is an __initcall aka device_initcall. It
is rather time-consuming; on my board it takes around 11ms. That's
about 1% of the time budget I have from U-Boot letting go and until
linux must assume responsibility of keeping the external watchdog
happy.
There's no particular reason this would need to run at device_initcall
time, so instead make it a late_initcall to allow vital functionality
to get started a bit sooner.
This actually ends up winning more than just those 11ms, because the
slab caches that get created during other device_initcalls (and before
my watchdog device gets probed) now don't end up doing the somewhat
expensive sysfs_slab_add() themselves. Some example lines (with
initcall_debug set) before/after:
initcall ext4_init_fs+0x0/0x1ac returned 0 after 1386 usecs
initcall journal_init+0x0/0x138 returned 0 after 517 usecs
initcall init_fat_fs+0x0/0x68 returned 0 after 294 usecs
initcall ext4_init_fs+0x0/0x1ac returned 0 after 240 usecs
initcall journal_init+0x0/0x138 returned 0 after 32 usecs
initcall init_fat_fs+0x0/0x68 returned 0 after 18 usecs
Altogether, this means I now get to petting the watchdog around 17ms
sooner. [Of course, the time the other initcalls save is instead spent
in slab_sysfs_init(), which goes from 11ms to 16ms, so there's no
overall change in boot time.]
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
| -rw-r--r-- | mm/slub.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/slub.c b/mm/slub.c index 76f4d3c41511..f162683f3006 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -6049,8 +6049,7 @@ static int __init slab_sysfs_init(void) mutex_unlock(&slab_mutex); return 0; } - -__initcall(slab_sysfs_init); +late_initcall(slab_sysfs_init); #endif /* CONFIG_SYSFS */ #if defined(CONFIG_SLUB_DEBUG) && defined(CONFIG_DEBUG_FS) |