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authorIngo Molnar <mingo@kernel.org>2022-03-15 09:02:10 +0100
committerIngo Molnar <mingo@kernel.org>2022-03-15 09:05:05 +0100
commitccacfe56d7ecdd2922256b87e9ea46f13bb03b55 (patch)
tree1e8e35493c74ae579f977af08fcb9e4dccfd8faf /drivers/usb/early
parentf2aa197e4794bf4c2c0c9570684f86e6fa103e8b (diff)
parent4ff8f2ca6ccd9e0cc5665d09f86d631b3ae3a14c (diff)
downloadlinux-ccacfe56d7ecdd2922256b87e9ea46f13bb03b55.tar.bz2
Merge branch 'sched/fast-headers' into sched/core
Merge the scheduler build speedup of the fast-headers tree. 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 <mingo@kernel.org>
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