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Date: Sat, 15 Feb 2014 17:28:44 -0500 From: Dave Jones <davej@...hat.com> To: Dave Chinner <david@...morbit.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Al Viro <viro@...iv.linux.org.uk>, Eric Sandeen <sandeen@...deen.net>, Linux Kernel <linux-kernel@...r.kernel.org>, xfs@....sgi.com Subject: Re: 3.14-rc2 XFS backtrace because irqs_disabled. On Sun, Feb 16, 2014 at 09:23:56AM +1100, Dave Chinner wrote: > There's a pretty massive difference between the actual stack usage > of the local variables and the amount of stack being used by the > compiled code. > > What it appears to be is that the compiler is pushing 6-10 registers > to the stack on every function call. So a function that only has 3 > local variables and does very little but allocate a structure and > call other functions saves an 6 registers to the stack before it > starts: I've got a shitload of debug options enabled, which may explain it. Or perhaps that new STACK_PROTECTOR_STRONG stuff ? Dave -- 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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