From: Matt Turner <mattst88@gmail.com>
To: Richard Henderson <richard.henderson@linaro.org>,
Magnus Lindholm <linmag7@gmail.com>
Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, linux-perf-users@vger.kernel.org,
Matt Turner <mattst88@gmail.com>
Subject: [PATCH 0/4] alpha: perf register sampling and user stack dumps
Date: Sun, 11 Oct 2026 16:16:40 -0400 [thread overview]
Message-ID: <20261011-alpha-perf-regs-v3-v1-0-eaa625a39712@gmail.com> (raw)
This lets perf sample registers and dump the user stack on alpha, which
perf record --call-graph dwarf needs to unwind user space.
r9-r15 are not in pt_regs, so they cannot be sampled. An unwinder
therefore cannot get past a first frame that uses $15 as its frame
pointer (-O0 code or alloca).
The perf tool side is a separate patch for perf-tools-next. libdw also
needs alpha unwinding support, which I am sending to elfutils-devel.
---
Matt Turner (4):
alpha: fix stale user_stack_pointer()
alpha: stop storing the user stack pointer in pt_regs
alpha: use user_stack_pointer() in KSTK_ESP() and dump_elf_thread()
alpha: add HAVE_PERF_REGS and HAVE_PERF_USER_STACK_DUMP support
.../features/perf/perf-regs/arch-support.txt | 2 +-
.../features/perf/perf-stackdump/arch-support.txt | 2 +-
arch/alpha/Kconfig | 2 +
arch/alpha/include/asm/processor.h | 3 +-
arch/alpha/include/asm/ptrace.h | 7 +--
arch/alpha/include/uapi/asm/perf_regs.h | 45 +++++++++++++++++
arch/alpha/include/uapi/asm/ptrace.h | 2 +-
arch/alpha/kernel/Makefile | 1 +
arch/alpha/kernel/asm-offsets.c | 1 -
arch/alpha/kernel/entry.S | 5 --
arch/alpha/kernel/perf_regs.c | 56 ++++++++++++++++++++++
arch/alpha/kernel/process.c | 2 +-
arch/alpha/kernel/ptrace.c | 12 +++++
arch/alpha/kernel/traps.c | 8 ----
14 files changed, 122 insertions(+), 26 deletions(-)
---
base-commit: 8f5dbfb93440d1aba216a1a34369a65654b94be9
change-id: 20261001-alpha-perf-regs-v3-7e23508c1ca2
Best regards,
--
Matt Turner <mattst88@gmail.com>
next reply other threads:[~2026-10-11 20:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-11 20:16 Matt Turner [this message]
2026-10-11 20:16 ` [PATCH 1/4] alpha: fix stale user_stack_pointer() Matt Turner
2026-10-12 16:18 ` Magnus Lindholm
2026-10-11 20:16 ` [PATCH 2/4] alpha: stop storing the user stack pointer in pt_regs Matt Turner
2026-10-12 16:20 ` Magnus Lindholm
2026-10-11 20:16 ` [PATCH 3/4] alpha: use user_stack_pointer() in KSTK_ESP() and dump_elf_thread() Matt Turner
2026-10-12 17:12 ` Magnus Lindholm
2026-10-11 20:16 ` [PATCH 4/4] alpha: add HAVE_PERF_REGS and HAVE_PERF_USER_STACK_DUMP support Matt Turner
2026-10-12 17:34 ` Magnus Lindholm
2026-10-11 21:47 ` [PATCH 0/4] alpha: perf register sampling and user stack dumps Ian Rogers
2026-10-12 15:51 ` Magnus Lindholm
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