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Date: Wed, 26 Nov 2008 12:18:50 +0900 From: Paul Mundt <lethal@...ux-sh.org> To: walimis <walimisdev@...il.com> Cc: Steven Rostedt <rostedt@...dmis.org>, Liming Wang <liming.wang@...driver.com>, Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/1] ftrace: adding other non-leaving .text sections On Wed, Nov 26, 2008 at 11:14:38AM +0800, walimis wrote: > On Wed, Nov 26, 2008 at 12:04:46PM +0900, Paul Mundt wrote: > >On Tue, Nov 25, 2008 at 10:03:35PM -0500, Steven Rostedt wrote: > >> > >> On Wed, 26 Nov 2008, Liming Wang wrote: > >> > >> > Please review this patch, and I don't know whether new sections will conflict > >> > with sched tracer or others. > >> > This patch is against Steven tree's tip/devel latest commit. > >> > > >> > Impact: improve recordmcount.pl > >> > > >> > Besides .text section, there are three .text sections that won't > >> > be freed after kernel booting. They are: .sched.text, .spinlock.text > >> > and .kprobes.text, which contain functions we can trace. But the last > >> > section ".kprobes.text" is particular, which has been marked as "notrace", > >> > we ignore it. Thus we add other two sections. > >> > >> Yep, only those sections that we know will not disappear are OK. I was > >> conservative with only using ".text" but I knew there were other sections > >> that were OK, so I used the hash array to make it easy to add others. > >> > >Does your .text cover .text.head by the way? > No, and not needed. Because .text.head is of booting code, to which > function tracer can't trace. > In the case of CPU hotplug it can be entered at any time. I don't see why it can't be traced from the boot CPU at least. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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