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Message-ID: <20241008192115.72cabba4@gandalf.local.home>
Date: Tue, 8 Oct 2024 19:21:15 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>, Alexei Starovoitov <ast@...nel.org>,
Yonghong Song <yhs@...com>, "Paul E . McKenney" <paulmck@...nel.org>, Ingo
Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark
Rutland <mark.rutland@....com>, Alexander Shishkin
<alexander.shishkin@...ux.intel.com>, Namhyung Kim <namhyung@...nel.org>,
Andrii Nakryiko <andrii.nakryiko@...il.com>, bpf@...r.kernel.org, Joel
Fernandes <joel@...lfernandes.org>, linux-trace-kernel@...r.kernel.org,
Michael Jeanson <mjeanson@...icios.com>
Subject: Re: [PATCH v3 3/8] tracing/perf: guard syscall probe with
preempt_notrace
On Fri, 4 Oct 2024 10:58:13 -0400
Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:
> #undef DECLARE_EVENT_SYSCALL_CLASS
> -#define DECLARE_EVENT_SYSCALL_CLASS DECLARE_EVENT_CLASS
> +#define DECLARE_EVENT_SYSCALL_CLASS(call, proto, args, tstruct, assign, print) \
> +__DECLARE_EVENT_CLASS(call, PARAMS(proto), PARAMS(args), PARAMS(tstruct), \
> + PARAMS(assign), PARAMS(print)) \
> +static notrace void \
> +perf_trace_##call(void *__data, proto) \
> +{ \
> + u64 __count __attribute__((unused)); \
> + struct task_struct *__task __attribute__((unused)); \
> + \
> + guard(preempt_notrace)(); \
> + do_perf_trace_##call(__data, args); \
> +}
>
Same here. The new guard() interface is really nice for complex functions,
but looks a bit overkill to cover a single line.
-- Steve
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