kernel dynamic memory allocation tracking and reduction
; Summary: kernel dynamic memory allocation tracking and reduction
; Proposer: Tim Bird, Sony Network Entertainment
== Description ==
The purpose of this project is to identify (and hopefully reduce) extraneous
dynamic memory allocations by the Linux kernel, in an effort to reduce overall
the runtime kernel memory footprint. For systems with less than 4M, this is
still important.
This project would consist of identifying kernel dynamic memory allocations,
and "wasted areas" due to memory fragmentation, bad fit between requested
and provided memory areas, and overhead caused by the allocator itself.
The goal would be to determine which parts of the Linux kernel
allocated too much memory, or wasted memory through fragmentation or
inefficiency, and to improve them.
Other efforts, to identify and optimize static memory utilization are
well-know and still available. Linux-tiny used to have a patch which
implemented the slab memory allocator, to provide detailed information
about each caller of kmalloc and kmem_cache_alloc().
It would be nice to revive this work, and use it to improve the memory
footprint of the kernel.
== Related work ==
* /proc/slabinfo and tools/vm/slabinfo
* does tools/vm/slabinfo cross-compile?
* CONFIG_DEBUG_PAGEALLOC and CONFIG_DEBUG_SLAB and CONFIG_TRACING
* does tracing, with appropriate event capture, and a post-processing tool,
accomplish what is needed?
* see slob-accounting.patch at:
http://elinux.org/index.php?title=Linux_Tiny_Patch_Details
* CONFIG_DEBUG_SLOB_ACCOUNT and CONFIG_KMALLOC_ACCOUNTING
* Tim has an updated, but never published patches:
* /proc/cache_account, casort, slabalyze
* /proc/kmalloc-accounting (replaced by cache_account?)
== Scope ==
Unknown
== Contractor Candidates ==
None so far
== Comments ==
[[Category:Project proposals 2012]]
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