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Re: Does ggc-page.c require MMAP_DEV_ZERO and MMAP_ANON?
"H. J. Lu" <hjl@lucon.org> writes:
> On Mon, Jun 23, 2003 at 09:21:15AM -0700, Zack Weinberg wrote:
>> "H. J. Lu" <hjl@lucon.org> writes:
>>
>> > checking for working mmap from /dev/zero... no
>> > checking for working mmap with MAP_ANON(YMOUS)... no
>> >
>> > As the result, I had
>> >
>> > /* #undef HAVE_MMAP_DEV_ZERO */
>> > /* #undef HAVE_MMAP_ANON */
>> > #define HAVE_MMAP_FILE 1
>> >
>> > in auto-host.h. Apparently, ggc-page.c doesn't work too well with
>> > this configuration.
>>
>> This would be xvalloc mode, which is _supposed_ to work, but is rarely
>> if ever tested. Can you try to debug it a bit more?
>>
>
> I can no longer duplicate the problem. It must be a very tricky bug.
> I didn't notice mmap was not used for several weeks and there were
> no problems. It must be a very rare case.
Bleah.
Well, if the RM is okay with it, I'll be happy to put the
configure-check rewrite into 3.3, which will at least thoroughly
plaster over the problem.
zw