Puranjay Mohan 2ddec2c80b riscv, bpf: inline bpf_get_smp_processor_id() ... Inline the calls to bpf_get_smp_processor_id() in the riscv bpf jit. RISCV saves the pointer to the CPU's task_struct in the TP (thread pointer) register. This makes it trivial to get the CPU's processor id. As thread_info is the first member of task_struct, we can read the processor id from TP + offsetof(struct thread_info, cpu). RISCV64 JIT output for `call bpf_get_smp_processor_id` ====================================================== Before After -------- ------- auipc t1,0x848c ld a5,32(tp) jalr 604(t1) mv a5,a0 Benchmark using [1] on Qemu. ./benchs/run_bench_trigger.sh glob-arr-inc arr-inc hash-inc +---------------+------------------+------------------+--------------+ | Name | Before | After | % change | |---------------+------------------+------------------+--------------| | glob-arr-inc | 1.077 ± 0.006M/s | 1.336 ± 0.010M/s | + 24.04% | | arr-inc | 1.078 ± 0.002M/s | 1.332 ± 0.015M/s | + 23.56% | | hash-inc | 0.494 ± 0.004M/s | 0.653 ± 0.001M/s | + 32.18% | +---------------+------------------+------------------+--------------+ NOTE: This benchmark includes changes from this patch and the previous patch that implemented the per-cpu insn. [1] https://github.com/anakryiko/linux/commit/8dec900975ef Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Björn Töpel <bjorn@kernel.org> Link: https://lore.kernel.org/r/20240502151854.9810-3-puranjay@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2024-05-12 16:54:34 -07:00
..
boot	RISC-V Patches for the 6.9 Merge Window	2024-03-22 10:41:13 -07:00
configs	RISC-V Patches for the 6.9 Merge Window	2024-03-22 10:41:13 -07:00
crypto	crypto: riscv - add vector crypto accelerated AES-CBC-CTS	2024-03-20 08:56:11 -07:00
errata	riscv: errata: Rename defines for Andes	2024-03-12 07:13:12 -07:00
include	riscv: mm: implement pgprot_nx	2024-03-27 07:09:06 -07:00
kernel	riscv: process: Fix kernel gp leakage	2024-04-04 12:35:05 -07:00
kvm	RISC-V: KVM: Fix APLIC in_clrip[x] read emulation	2024-03-26 09:40:55 +05:30
lib	RISC-V Patches for the 6.9 Merge Window	2024-03-22 10:41:13 -07:00
mm	riscv: mm: Fix prototype to avoid discarding const	2024-03-26 08:26:43 -07:00
net	riscv, bpf: inline bpf_get_smp_processor_id()	2024-05-12 16:54:34 -07:00
purgatory	riscv: Use SYM_*() assembly macros instead of deprecated ones	2023-11-06 09:42:47 -08:00
tools
Kbuild	RISC-V: hook new crypto subdir into build-system	2024-01-22 17:55:17 -08:00
Kconfig	RISC-V Patches for the 6.9 Merge Window	2024-03-22 10:41:13 -07:00
Kconfig.debug	riscv: Add tests for riscv module loading	2023-11-07 14:59:32 -08:00
Kconfig.errata	RISC-V Patches for the 6.8 Merge Window, Part 4	2024-01-20 11:06:04 -08:00
Kconfig.socs	riscv: dts: Move BUILTIN_DTB_SOURCE to common Kconfig	2024-03-06 00:08:32 +00:00
Makefile	riscv: compat_vdso: install compat_vdso.so.dbg to /lib/modules/*/vdso/	2024-03-26 14:08:02 -07:00
Makefile.postlink	kbuild: remove ARCH_POSTLINK from module builds	2023-10-28 21:10:08 +09:00