xtest: stats: report heap fragmentation metric #781
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There is a typo 'Unkown' in the error message, should be changed to 'Unknown' instead. Signed-off-by: Aristo Chen <[email protected]> Reviewed-by: Jens Wiklander <[email protected]> Acked-by: Jens Wiklander <[email protected]>
A new field is added to struct pta_stats_alloc, free2_sum, the sum of size^2 of each free chunk. This can be used to calculate a fragmentation metric for the heap [1]. Some examples with xtest --stats --alloc: When booted: Pool: Heap Bytes allocated: 21376 Fragmentation: 3 % Max bytes allocated: 21488 Size of pool: 202608 At some point during xtest: Pool: Heap Bytes allocated: 31616 Fragmentation: 54 % Max bytes allocated: 101312 Size of pool: 202608 When xtest has completed: Pool: Heap Bytes allocated: 25824 Fragmentation: 33 % Max bytes allocated: 101312 Size of pool: 202608 Link: [1] https://asawicki.info/news_1757_a_metric_for_memory_fragmentation Signed-off-by: Jens Wiklander <[email protected]>
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Depends on OP-TEE/optee_os#7302 |
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A new field is added to struct pta_stats_alloc, free2_sum, the sum of size^2 of each free chunk. This can be used to calculate a fragmentation metric for the heap [1]. Some examples with xtest --stats --alloc:
When booted:
Pool: Heap
Bytes allocated: 21376
Fragmentation: 3 %
Max bytes allocated: 21488
Size of pool: 202608
At some point during xtest:
Pool: Heap
Bytes allocated: 31616
Fragmentation: 54 %
Max bytes allocated: 101312
Size of pool: 202608
When xtest has completed:
Pool: Heap
Bytes allocated: 25824
Fragmentation: 33 %
Max bytes allocated: 101312
Size of pool: 202608
Link: [1] https://asawicki.info/news_1757_a_metric_for_memory_fragmentation