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Date: Sat, 29 Mar 2014 17:00:32 +0000
From: u-igbb@...ey.se
To: musl@...ts.openwall.com
Subject: malloc not behaving well when brk space is limited?
Hello,
Background:
Compiling a native musl-based toolchain for ia32 on Linux 2.6+.
Using the standalone dynamic loader mode.
(The latter seems to lead to a quite limited heap space, by kernel
behaviour/design)
I encounter out of memory errors. A look at the malloc source does not
find any fallback to mmap when heap is exhausted. What would you suggest
as a suitable approach to make it work?
Somebody has possibly already encountered and solved this with musl?
I see also reports about a related out of memory problem with
pae-executables which means a solution might help many musl users.
The other standard libraries I am using (glibc, uclibc) seem to happily
switch to allocation from mmap() when the heap is full. I understand
that this costs some code and performance but a breakup is no good either.
Any ideas? Maintaining and using an external libmalloc or substituting
malloc in musl? This feels like quite a burden...
(Would musl internal calls to malloc notice the external library
and resolve to its entry points instead of the internal malloc?)
Rune
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