Messages in this thread | | | Date | Sat, 15 Feb 2014 17:28:44 -0500 | From | Dave Jones <> | Subject | Re: 3.14-rc2 XFS backtrace because irqs_disabled. |
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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
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