From 4ff8f2ca6ccd9e0cc5665d09f86d631b3ae3a14c Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 22 Feb 2022 14:51:58 +0100 Subject: sched/headers: Reorganize, clean up and optimize kernel/sched/sched.h dependencies Remove all headers, except the ones required to make this header build standalone. Also include stats.h in sched.h explicitly - dependencies already require this. Summary of the build speedup gained through the last ~15 scheduler build & header dependency patches: Cumulative scheduler (kernel/sched/) build time speedup on a Linux distribution's config, which enables all scheduler features, compared to the vanilla kernel: _____________________________________________________________________________ | | Vanilla kernel (v5.13-rc7): |_____________________________________________________________________________ | | Performance counter stats for 'make -j96 kernel/sched/' (3 runs): | | 126,975,564,374 instructions # 1.45 insn per cycle ( +- 0.00% ) | 87,637,847,671 cycles # 3.959 GHz ( +- 0.30% ) | 22,136.96 msec cpu-clock # 7.499 CPUs utilized ( +- 0.29% ) | | 2.9520 +- 0.0169 seconds time elapsed ( +- 0.57% ) |_____________________________________________________________________________ | | Patched kernel: |_____________________________________________________________________________ | | Performance counter stats for 'make -j96 kernel/sched/' (3 runs): | | 50,420,496,914 instructions # 1.47 insn per cycle ( +- 0.00% ) | 34,234,322,038 cycles # 3.946 GHz ( +- 0.31% ) | 8,675.81 msec cpu-clock # 3.053 CPUs utilized ( +- 0.45% ) | | 2.8420 +- 0.0181 seconds time elapsed ( +- 0.64% ) |_____________________________________________________________________________ Summary: - CPU time used to build the scheduler dropped by -60.9%, a reduction from 22.1 clock-seconds to 8.7 clock-seconds. - Wall-clock time to build the scheduler dropped by -3.9%, a reduction from 2.95 seconds to 2.84 seconds. Signed-off-by: Ingo Molnar Reviewed-by: Peter Zijlstra --- kernel/sched/stats.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'kernel/sched/stats.h') diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h index a0df79e6038c..baa839c1ba96 100644 --- a/kernel/sched/stats.h +++ b/kernel/sched/stats.h @@ -2,8 +2,6 @@ #ifndef _KERNEL_STATS_H #define _KERNEL_STATS_H -#include "sched.h" - #ifdef CONFIG_SCHEDSTATS extern struct static_key_false sched_schedstats; -- cgit v1.2.3