From: Tom Rini <trini@ti.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 0/21] Add tracing functionality to U-Boot
Date: Wed, 26 Jun 2013 16:24:35 -0400 [thread overview]
Message-ID: <20130626202435.GN28078@bill-the-cat> (raw)
In-Reply-To: <1370974493-21822-1-git-send-email-sjg@chromium.org>
On Tue, Jun 11, 2013 at 11:14:32AM -0700, Simon Glass wrote:
> This series adds a tracing feature to U-Boot which is useful for
> profiling boot time and other purposes.
>
> The core trace library relies on standard gcc function instrumentation
> and a microsecond timer which should work correctly on almost any
> architecture. Generic board is used to avoid the need to add the same
> code in multiple places (CONFIG_SYS_GENERIC_BOARD).
>
> Tracing must be built into the U-Boot image at build time, but can be
> paused and resumed while running. A trace buffer is used to collect
> trace information. This buffer can then be transmitted to a host for
> processing. A host-based processing tool is provided which converts the
> data to the same format used by Linux, and that can be read by the
> pytimechart GUI tool.
>
> A U-Boot 'trace' command provides access to the trace information,
> including support for writing it to memory in a few forms.
>
> Support is provided for stopping tracing at the last possible moment in
> the bootm process (just before U-Boot jumps to the OS). This is done with
> a new 'fake go' command, which allows bootm to go through the motions of
> an OS boot without actually committing to it. Once the 'fake go' is
> complete, U-Boot can stop tracing and continue execution to transmit the
> trace information to the host, before jumping to the OS for real.
>
> The system is tested on sandbox, x86 and smdk5250/snow. It may work
> correctly on Tegra and other machines but unfortunately has not been
> tested. A simple test script is provided for sandbox, along with
> documentation on how to use the feature.
>
> This feature has been successfully used alongside bootstage to locate
> bottlenecks and reduce overall boot time.
With v3 of 17/21, applied to u-boot/master, thanks!
--
Tom
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prev parent reply other threads:[~2013-06-26 20:24 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-11 18:14 [U-Boot] [PATCH v2 0/21] Add tracing functionality to U-Boot Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 01/21] pci: Convert extern inline functions to static inline Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 02/21] x86: Correct missing local variable in bootm Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 03/21] Fix missing return in do_mem_loop() Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 04/21] Show stdout on error in fit-test Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 05/21] bootstage: Correct printf types Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 06/21] Add function to print a number with grouped digits Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 07/21] Add trace library Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 08/21] Add a trace command Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 09/21] Support tracing in config.mk when enabled Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 10/21] Add trace support to generic board Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 11/21] Add proftool to decode profile data Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 12/21] sandbox: Support trace feature Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 13/21] Add a simple test for sandbox trace Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 14/21] Clarify bootm OS arguments Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 15/21] Refactor the bootm command to reduce code duplication Simon Glass
2013-06-27 13:40 ` Stefan Roese
2013-06-27 14:40 ` Tom Rini
2013-06-27 15:39 ` Simon Glass
2013-06-27 19:51 ` Simon Glass
2013-06-27 20:07 ` Tom Rini
2013-06-28 2:14 ` Simon Glass
2013-06-28 4:12 ` Stefan Roese
2013-06-28 5:44 ` Simon Glass
2013-06-28 6:58 ` Simon Glass
2013-06-28 7:04 ` Stefan Roese
2013-06-28 7:12 ` Simon Glass
2013-06-28 7:57 ` Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 16/21] Add a 'fake' go command to the bootm command Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 17/21] arm: Implement the 'fake' go command Simon Glass
2013-06-11 19:59 ` Albert ARIBAUD
2013-06-11 20:02 ` Simon Glass
2013-06-11 20:21 ` Albert ARIBAUD
2013-06-11 21:17 ` Simon Glass
2013-06-11 21:36 ` Albert ARIBAUD
2013-06-20 4:16 ` Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 18/21] exynos: Avoid function instrumentation for microsecond timer Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 19/21] exynos: config: Add tracing options Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 20/21] x86: Support tracing function Simon Glass
2013-06-11 18:14 ` [U-Boot] [PATCH v2 21/21] x86: config: Add tracing options Simon Glass
2013-06-26 20:24 ` Tom Rini [this message]
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