linux-kernel - Re: [PATCH v5 14/20] scripts/gdb: Add internal helper and convenience function to retrieve thread

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Date:	Tue, 29 Jan 2013 14:59:46 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Tom Tromey <tromey@...hat.com>,
	Ben Widawsky <ben@...dawsk.net>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org
Subject: Re: [PATCH v5 14/20] scripts/gdb: Add internal helper and
 convenience function to retrieve thread_info

On Tue, Jan 29, 2013 at 01:37:57PM +0100, Jan Kiszka wrote:
> Add the internal helper get_thread_info that calculated the thread_info
> from a given task variable. Also export this service as a convenience
> function.
> 
> Note: ia64 version is untested.
> 
> CC: Tony Luck <tony.luck@...el.com>
> CC: Fenghua Yu <fenghua.yu@...el.com>
> CC: linux-ia64@...r.kernel.org
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---

[ … ]

> +class LxThreadInfoFunc (gdb.Function):
> +	# Calculate Linux thread_info from task variable.
> +	__doc__ = "Calculate Linux thread_info from task variable.\n" \
> +		  "\n" \
> +		  "$lx_thread_info(TASK): Given TASK, return the corresponding thread_info\n" \
> +		  "variable."
> +
> +	def __init__(self):
> +		super(LxThreadInfoFunc, self).__init__("lx_thread_info")
> +
> +	def invoke(self, task):
> +		return get_thread_info(task)
> +
> +LxThreadInfoFunc()

Nice, you can plug commands into one-another:

(gdb) p $lx_thread_info($lx_current())
$12 = {task = 0xffffffff81a14440, exec_domain = 0xffffffff81a21e00, flags = 0, status = 0, cpu = 0, 
  preempt_count = 1, addr_limit = {seg = 18446744073709551615}, restart_block = {
    fn = 0xffffffff81054cd0 <do_no_restart_syscall>, {futex = {uaddr = 0x0, val = 0, flags = 0, bitset = 0, 
        time = 0, uaddr2 = 0x0}, nanosleep = {clockid = 0, rmtp = 0x0, compat_rmtp = 0x0, expires = 0}, 
      poll = {ufds = 0x0, nfds = 0, has_timeout = 0, tv_sec = 0, tv_nsec = 0}}}, sysenter_return = 0x0, 
  sig_on_uaccess_error = 0, uaccess_err = 0}

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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