8 Nov
2007
8 Nov
'07
9:38 p.m.
On Friday 09 November 2007, Stefano D'Angelo wrote:
[...]
Yes, that's what it does - which is why I suggested it. ;-)
[...]
Well, not really; you could just wrap the memory manager, adding
a 'manager' field to every chunk. Then you can just throw in another
TLSF manager instance when you need more memory. The 'manager' field
will point the free() wrapper to the correct manager instance.
However, a nice, clean, efficient solution might be a bit harder to
come up with, I think. IIRC, the current TLSF implementations scale
various internal structures and stuff to fit the pool size, so you
can't just bump the "brk limit" later.
Maybe hack TLSF to take a "maximum address span" init argument, so you
can extend the pool as needed up to that limit? You'd just allocate
new blocks with malloc() and instruct the hacked TLSF to extend to
the end of that block, while pre-allocating (throwing away) any holes
caused by unrelated malloc()s.
Yes,
that's exactly my point, but I think it needs to deal with
arbitrary size chunks to actually be able to serve that purpose in
real applications.
IIRC the TLSF allocator can do that. Wouldn't
it be more useful with some interface that allows plugins
to request memory in a non-blocking manner, and if instant
allocation fails, have the host notify the plugin when the memory
is available?
Basically, a malloc() call that means "If I can't have this memory
right away, please expand the pool so I can have it later!"
Mmmm.. I guess it's not easy to resize the pool in a rt-safe way. And even if you have some background thread doing it
when it's
needed, I think it's very hard to do that while plugins are running,
and so allocating and modifying on that memory.
Yes, that's why you can't realloc() the pool. You really have to add
new blocks of memory to it.
//David Olofson - Programmer, Composer, Open Source Advocate
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