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From: Steven Rostedt <rostedt@goodmis.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	mhiramat@kernel.org, bristot@redhat.com, jbaron@akamai.com,
	torvalds@linux-foundation.org, tglx@linutronix.de,
	mingo@kernel.org, namit@vmware.com, hpa@zytor.com,
	luto@kernel.org, ard.biesheuvel@linaro.org, jpoimboe@redhat.com,
	pbonzini@redhat.com, mathieu.desnoyers@efficios.com,
	linux@rasmusvillemoes.dk
Subject: Re: [PATCH v6 07/17] static_call: Add inline static call infrastructure
Date: Fri, 10 Jul 2020 17:57:05 -0400	[thread overview]
Message-ID: <20200710175705.5c20f7f7@oasis.local.home> (raw)
In-Reply-To: <20200710134336.560096994@infradead.org>

On Fri, 10 Jul 2020 15:38:38 +0200
Peter Zijlstra <peterz@infradead.org> wrote:

> From: Josh Poimboeuf <jpoimboe@redhat.com>
> 
> Add infrastructure for an arch-specific CONFIG_HAVE_STATIC_CALL_INLINE
> option, which is a faster version of CONFIG_HAVE_STATIC_CALL.  At
> runtime, the static call sites are patched directly, rather than using
> the out-of-line trampolines.
> 
> Compared to out-of-line static calls, the performance benefits are more
> modest, but still measurable.  Steven Rostedt did some tracepoint
> measurements:
> 
>   https://lkml.kernel.org/r/20181126155405.72b4f718@gandalf.local.home
> 
> This code is heavily inspired by the jump label code (aka "static
> jumps"), as some of the concepts are very similar.
> 
> For more details, see the comments in include/linux/static_call.h.
> 
> [peterz: simplified interface; merged trampolines]
> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

-- Steve


> ---
>  arch/Kconfig                      |    4 
>  include/asm-generic/vmlinux.lds.h |    7 
>  include/linux/module.h            |    5 
>  include/linux/static_call.h       |   36 ++++
>  include/linux/static_call_types.h |   13 +
>  kernel/Makefile                   |    1 
>  kernel/module.c                   |    5 
>  kernel/static_call.c              |  303 ++++++++++++++++++++++++++++++++++++++
>  8 files changed, 373 insertions(+), 1 deletion(-)
>  create mode 100644 kernel/static_call.c

  reply	other threads:[~2020-07-10 21:57 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-10 13:38 [PATCH v6 00/17] Add static_call Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 01/17] notifier: Fix broken error handling pattern Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 02/17] module: Fix up module_notifier return values Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 03/17] module: Properly propagate MODULE_STATE_COMING failure Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 04/17] jump_label,module: Fix module lifetime for __jump_label_mod_text_reserved Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 05/17] compiler.h: Make __ADDRESSABLE() symbol truly unique Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 06/17] static_call: Add basic static call infrastructure Peter Zijlstra
2020-07-10 21:56   ` Steven Rostedt
2020-07-10 13:38 ` [PATCH v6 07/17] static_call: Add inline " Peter Zijlstra
2020-07-10 21:57   ` Steven Rostedt [this message]
2020-07-10 13:38 ` [PATCH v6 08/17] static_call: Avoid kprobes on inline static_call()s Peter Zijlstra
2020-07-10 22:00   ` Steven Rostedt
2020-07-11 10:30     ` Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 09/17] x86/static_call: Add out-of-line static call implementation Peter Zijlstra
2020-07-10 22:13   ` Steven Rostedt
2020-07-11 10:11     ` Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 10/17] x86/static_call: Add inline static call implementation for x86-64 Peter Zijlstra
2020-07-10 22:31   ` Steven Rostedt
2020-07-11  9:56     ` Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 11/17] static_call: Simple self-test Peter Zijlstra
2020-07-10 22:42   ` Steven Rostedt
2020-07-11 10:27     ` Peter Zijlstra
2020-07-13 20:26       ` Steven Rostedt
2020-07-10 13:38 ` [PATCH v6 12/17] x86/alternatives: Teach text_poke_bp() to emulate RET Peter Zijlstra
2020-07-10 22:44   ` Steven Rostedt
2020-07-10 13:38 ` [PATCH v6 13/17] static_call: Add static_call_cond() Peter Zijlstra
2020-07-10 23:08   ` Steven Rostedt
2020-07-11  5:09     ` Peter Zijlstra
2020-07-11 10:49     ` Peter Zijlstra
2020-07-13 20:32       ` Steven Rostedt
2020-07-14  9:53         ` Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 14/17] static_call: Handle tail-calls Peter Zijlstra
2020-07-11  0:23   ` Steven Rostedt
2020-07-11  5:06     ` Peter Zijlstra
2020-07-11  5:08     ` Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 15/17] static_call: Allow early init Peter Zijlstra
2020-07-11  1:14   ` Steven Rostedt
2020-07-11  5:08     ` Peter Zijlstra
2020-07-13 20:24       ` Steven Rostedt
2020-07-14  9:51         ` Peter Zijlstra
2020-07-14 14:16           ` Steven Rostedt
2020-07-14 15:54             ` Peter Zijlstra
2020-07-14 16:07               ` Steven Rostedt
2020-07-14 18:31                 ` Peter Zijlstra
2020-07-14 19:38                   ` Steven Rostedt
2020-07-10 13:38 ` [PATCH v6 16/17] tracepoint: Optimize using static_call() Peter Zijlstra
2020-07-10 13:38 ` [PATCH v6 17/17] x86/perf, static_call: Optimize x86_pmu methods Peter Zijlstra

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