linux-kernel - [PATCH v4 0/1] powerpc: Enable dynamic preemption

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Message-ID: <20250210184334.567383-1-sshegde@linux.ibm.com>
Date: Tue, 11 Feb 2025 00:13:33 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: maddy@...ux.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        christophe.leroy@...roup.eu
Cc: sshegde@...ux.ibm.com, mpe@...erman.id.au, npiggin@...il.com,
        bigeasy@...utronix.de, will@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/1] powerpc: Enable dynamic preemption

Now that preempt=lazy patches are merged upstream, sending out the
patch to support dynamic preemption based on DYNAMIC_KEY.

Once the arch supports static inline calls, it would be needed to
evaluate to see if that gives better performance.

This makes the same code for arm64 and powerpc. Will be sending an RFC
patch to move this static key into sched/core. 

v3->v4:
- Use static key instead of using preempt_model_preemptible 
  (Sebastian Andrzej Siewior and Christophe Leroy)
- Dropped printing the preemption model, since it is addressed 
  in a patchset from Sebastian Andrzej Siewior

v2->v3:
- fixed a build error reported by linux test robot by including jump
  label header.

v1->v2:
- Instead of copying asm-generic preempt.h content include it in
  arch/asm preempt.h. (Christophe Leroy)
- Merge the patches into one patch (Christophe Leroy)

v3: https://lore.kernel.org/all/20250106051919.55020-1-sshegde@linux.ibm.com/

Shrikanth Hegde (1):
  powerpc: enable dynamic preemption

 arch/powerpc/Kconfig               |  1 +
 arch/powerpc/include/asm/preempt.h | 16 ++++++++++++++++
 arch/powerpc/kernel/interrupt.c    |  6 +++++-
 arch/powerpc/lib/vmx-helper.c      |  2 +-
 4 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100644 arch/powerpc/include/asm/preempt.h

-- 
2.39.3