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Date: Mon, 20 Nov 2000 19:24:14 -0800
From: Richard Henderson <rth AT redhat DOT com>
To: Zack Weinberg <zackw AT Stanford DOT EDU>
Cc: Kelley Cook <Kelley DOT Cook AT home DOT com>,
        Cygwin mailing list <Cygwin AT sources DOT redhat DOT com>,
        GCC Bugs <gcc-bugs AT gcc DOT gnu DOT org>, GCC Patches <gcc-patches AT gcc DOT gnu DOT org>
Subject: Re: Reason for cygwin GCC 2.97 non-bootstrap found
Message-ID: <20001120192414.D17317@redhat.com>
References: <200011202245 DOT eAKMjjN27680 AT plmlir3 DOT mail DOT eds DOT com> <20001120154222 DOT O17712 AT wolery DOT stanford DOT edu>
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In-Reply-To: <20001120154222.O17712@wolery.stanford.edu>; from Zack Weinberg on Mon, Nov 20, 2000 at 03:42:23PM -0800

On Mon, Nov 20, 2000 at 03:42:23PM -0800, Zack Weinberg wrote:
> +#if use_malloc
> +  return (char *) malloc (size);
> +#endif
[...]
> +  return res + offset;

I refuse to believe that there exists any magic size/roundup/offset
combination that *always* returns a full page of aligned memory.

The only semi-decent solution I can think of is to get N*pagesize+C
bytes from malloc, which can then be delivered as N' aligned data pages,
plus a control block of size C to determine when the entire block may
be freed.  N' will normally be N-1, but could accidentally be N.

Moreover, I think the ggc-page mmap optimizations are useful enough
that I do not want to defer everything to an xvalloc or the like.



r~

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