[v2] x86/smpboot: tidy sched-topology and drop useless SMT level

[PATCH V2 0/2] x86/smpboot: tidy sched-topology and drop useless SMT level

Li Chen posted 2 patches 3 months, 2 weeks ago

Diff against v1 v3 v4 v5
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There is a newer version of this series

arch/x86/kernel/smpboot.c | 59 +++++++++++++++++++++------------------
1 file changed, 32 insertions(+), 27 deletions(-)

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[PATCH V2 0/2] x86/smpboot: tidy sched-topology and drop useless SMT level

Posted by Li Chen 3 months, 2 weeks ago

From: Li Chen <chenl311@chinatelecom.cn>

This two–patch series cleans up sched-domain topology handling and
eliminates hundreds of pointless attach/destroy cycles when SMT is
not available.

Patch 1  (from Thomas, unchanged) gets rid of the #ifdef maze in
build_sched_topology() by statically initialising the topology array.

Patch 2  (mine) is a follow-up that simply memmoves the array when
cpu_smt_num_threads <= 1, so the SMT level never gets created and
immediately torn down again.

Tested on Qemu.

changelog:
v2: fix wording issue as suggested by Thomas [1]

[1]: https://www.spinics.net/lists/kernel/msg5732082.html

Li Chen (1):
  x86/smpboot: avoid SMT domain attach/destroy if SMT is not enabled

Thomas Gleixner (1):
  x86/smpboot: Decrapify build_sched_topology()

 arch/x86/kernel/smpboot.c | 59 +++++++++++++++++++++------------------
 1 file changed, 32 insertions(+), 27 deletions(-)

-- 
2.49.0