[Bug dynamic-link/30100] [patch] add dlmem()

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30100

--- Comment #6 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Stas Sergeev from comment #5)
> Thanks, getting closer!
> Now under "make check" I have this crash:
> 
> 112	  assert (ptr == alloc_last_block);
> (gdb) bt
> #0  __minimal_realloc (ptr=0x7ffff7fc2000, n=1680) at dl-minimal-malloc.c:112
> #1  0x00007ffff7fcf3b1 in realloc (size=1680, ptr=<optimized out>)
>     at ../include/rtld-malloc.h:62
> #2  filebuf_ensure (size=848, fb=0x7fffffffd4e0) at dl-load.c:149
> 
> 
> My code calls realloc(), but for some reason it ends up in
> __minimal_realloc(). Which is so minimal that it only supports
> the realloc of a last-allocated pointer. If some other allocation
> was in between, __minimal_realloc() asserts.
> How can I use the maximum realloc instead?

The minimal malloc should be only used by the loader on very specific cases, it
is a simple bump allocator without support advance features that generic malloc
provides (such as thread, fragmentation, etc).  If you need a more generic
memory allocator, it would be better to either restructure the patch to
pre-allocate the required memory or work with the bump allocator by trying to
use different algorithms that avoid fragmentation (I have not look into the
patch to comment what it would require).

You might try to extend the minimal malloc, but I am not sure if the complexity
would be worth.

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