use runtime constant to optimize handle_arch_irq access
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- v1 Latest3 patches 17 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/3 | vmlinux.lds.h: add _handle_arch_irq RUNTIME_CONST sectioninclude/ | +2 | 1 reply | |
| 2/3 | genirq: use runtime constant to optimize handle_arch_irq accessinclude/ kernel/ | +8 | 7 replies | |
| 3/3 | arm64: use runtime constant to optimize handle_arch_irq accessarch/ arch/ | +9 | 9 replies |
Reviews trailers per patch
1 of 3 patches has a Reviewed-by or Acked-by.
| Patch | Guo Ren (Alibaba Damo Academy) |
|---|---|
| 1/3 | |
| 2/3 | R-b |
| 3/3 |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH 0/3] use runtime constant to optimize handle_arch_irq access
Currently, on GENERIC_IRQ_MULTI_HANDLER or arm64 platforms, the handle_arch_irq is a pointer which is set during booting, and every irq processing needs to access it, so it sits in hot code path. We can use the runtime constant mechanism which was introduced by Linus to speed up its accessing.
Tested on Sipeed Lichee Pi 4A (riscv64) board, the perf sched benchmark is improved by ~5.8%
Tested on Quad CA55 platform, the perf sched benchmark is improved by ~6.5%
As for the GENERIC_IRQ_MULTI_HANDLER platforms but without runtime const support, such as arm, csky, loongarch, microblaze and openrisc, there should be no changes.
Jisheng Zhang (3):
vmlinux.lds.h: add _handle_arch_irq RUNTIME_CONST section
genirq: use runtime constant to optimize handle_arch_irq access
arm64: use runtime constant to optimize handle_arch_irq access
arch/arm64/kernel/entry-common.c | 4 +++- arch/arm64/kernel/irq.c | 9 ++++++--- include/asm-generic/vmlinux.lds.h | 3 ++- include/linux/irq.h | 4 +++- kernel/irq/handle.c | 8 +++++--- 5 files changed, 19 insertions(+), 9 deletions(-)
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2.51.0