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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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cfbcf46845
This makes perf_callchain_{user,kernel}() receive the max stack
as context for the perf_callchain_entry, instead of accessing
the global sysctl_perf_event_max_stack.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/n/tip-kolmn1yo40p7jhswxwrc7rrd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
42 lines
999 B
C
42 lines
999 B
C
/*
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* Performance event callchain support - SuperH architecture code
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*
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* Copyright (C) 2009 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/perf_event.h>
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#include <linux/percpu.h>
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#include <asm/unwinder.h>
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#include <asm/ptrace.h>
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static int callchain_stack(void *data, char *name)
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{
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return 0;
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}
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static void callchain_address(void *data, unsigned long addr, int reliable)
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{
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struct perf_callchain_entry_ctx *entry = data;
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if (reliable)
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perf_callchain_store(entry, addr);
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}
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static const struct stacktrace_ops callchain_ops = {
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.stack = callchain_stack,
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.address = callchain_address,
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};
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void
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perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
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{
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perf_callchain_store(entry, regs->pc);
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unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
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}
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