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author | Brian Behlendorf <behlendorf1@llnl.gov> | 2009-01-30 20:54:49 -0800 |
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committer | Brian Behlendorf <behlendorf1@llnl.gov> | 2009-01-30 20:54:49 -0800 |
commit | ea3e6ca9e595ebfba82b964ee2eaf1ddd7076f0f (patch) | |
tree | 7480b87145297f3882ffe18234280512e136cdb4 /lib | |
parent | 34e71c9e97f4d0d2b3ede850d016a7de558b0f3c (diff) |
kmem_cache hardening and performance improvements
- Added slab work queue task which gradually ages and free's slabs
from the cache which have not been used recently.
- Optimized slab packing algorithm to ensure each slab contains the
maximum number of objects without create to large a slab.
- Fix deadlock, we can never call kv_free() under the skc_lock. We
now unlink the objects and slabs from the cache itself and attach
them to a private work list. The contents of the list are then
subsequently freed outside the spin lock.
- Move magazine create/destroy operation on to local cpu.
- Further performace optimizations by minimize the usage of the large
per-cache skc_lock. This includes the addition of KMC_BIT_REAPING
bit mask which is used to prevent concurrent reaping, and to defer
new slab creation when reaping is occuring.
- Add KMC_BIT_DESTROYING bit mask which is set when the cache is being
destroyed, this is used to catch any task accessing the cache while
it is being destroyed.
- Add comments to all the functions and additional comments to try
and make everything as clear as possible.
- Major cleanup and additions to the SPLAT kmem tests to more
rigerously stress the cache implementation and look for any problems.
This includes correctness and performance tests.
- Updated portable work queue interfaces
Diffstat (limited to 'lib')
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