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Re: stack bloat after stackprotector changes

To: Eric Sandeen <sandeen@xxxxxxxxxxx>
Subject: Re: stack bloat after stackprotector changes
From: Tejun Heo <tj@xxxxxxxxxx>
Date: Tue, 06 Oct 2009 14:53:56 +0900
Cc: xfs mailing list <xfs@xxxxxxxxxxx>
In-reply-to: <4ACA5EB0.4010707@xxxxxxxxxxx>
References: <4ACA5EB0.4010707@xxxxxxxxxxx>
User-agent: Thunderbird (X11/20090605)
Eric Sandeen wrote:
> It seems that after:
> commit 5d707e9c8ef2a3596ed5c975c6ff05cec890c2b4
> Author: Tejun Heo <tj@xxxxxxxxxx>
> Date:   Mon Feb 9 22:17:39 2009 +0900
>     stackprotector: update make rules
> xfs stack usage jumped up a fair bit;
> Not a lot in each case but could be significant as it accumulates.
> I'm not familiar w/ the gcc stack protector feature; would this be an
> expected result?

Yeah, it adds a bit of stack usage per each function call and around
arrays which seem like they could overflow, so the behavior is
expected and I can see it can be a problem with function call depth
that deep.  Has it caused actual stack overflow?



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