From b52173065e0aad82a31863bb5f63ebe46f7eb657 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 17 Mar 2025 11:42:56 +0100 Subject: [PATCH] sched/debug: Remove CONFIG_SCHED_DEBUG For more than a decade, CONFIG_SCHED_DEBUG=y has been enabled in all the major Linux distributions: /boot/config-6.11.0-19-generic:CONFIG_SCHED_DEBUG=y The reason is that while originally CONFIG_SCHED_DEBUG started out as a debugging feature, over the years (decades ...) it has grown various bits of statistics, instrumentation and control knobs that are useful for sysadmin and general software development purposes as well. But within the kernel we still pretend that there's a choice, and sometimes code that is seemingly 'debug only' creates overhead that should be optimized in reality. So make it all official and make CONFIG_SCHED_DEBUG unconditional. Now that all uses of CONFIG_SCHED_DEBUG are removed from the code by previous patches, remove the Kconfig option as well. Signed-off-by: Ingo Molnar Tested-by: Shrikanth Hegde Cc: Peter Zijlstra Cc: Juri Lelli Cc: Vincent Guittot Cc: Dietmar Eggemann Cc: Steven Rostedt Cc: Ben Segall Cc: Mel Gorman Cc: Valentin Schneider Cc: Linus Torvalds Link: https://lore.kernel.org/r/20250317104257.3496611-6-mingo@kernel.org --- lib/Kconfig.debug | 9 --------- 1 file changed, 9 deletions(-) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 1af972a92d06..a2ab693d008d 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1301,15 +1301,6 @@ endmenu # "Debug lockups and hangs" menu "Scheduler Debugging" -config SCHED_DEBUG - bool "Collect scheduler debugging info" - depends on DEBUG_KERNEL && DEBUG_FS - default y - help - If you say Y here, the /sys/kernel/debug/sched file will be provided - that can help debug the scheduler. The runtime overhead of this - option is minimal. - config SCHED_INFO bool default n