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Message-ID: <20110806115014.GT29562@port70.net>
Date: Sat, 6 Aug 2011 13:50:15 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: New daily reports - debugging alloc.c et al
* Szabolcs Nagy <nsz@...t70.net> [2011-08-06 13:15:05 +0200]:
> pages, it would be better to do it in bigger chunks like:
>
> /*tries to mmap even more now:*/
> printf("Number of *additional* bytes mmap'd:\n");
> most=0;
> for(j=1<<20; j; j/=2) {
> printf("%8zu ", j);
> for(i=0; mmap(NULL, j*PAGE_SIZE, PROT_NONE, MAP_PRIVATE, fd, 0) != MAP_FAILED; ++i)
hm j=1<<20 is not the right choice, 1<<16 should be ok
> after this the last loop with malloc immediately
> fails (there is nothing to mmap anymore, but maybe
> if the allocator already has some area reserved
> then a few mallocs can succeed)
it seems if i add a small malloc at the begining of main
then the last loop can still allocate with glibc
(here glibc can allocate 32 pages worth of extra space)
interestingly /proc/self/smaps does not seem to
list all the successful mmaps.. i wonder why but
i did not investigate it further
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