Adding feature to query the fragmentation of immixspace #1089
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qinsoon
reviewed
Feb 29, 2024
wenyuzhao
reviewed
Mar 4, 2024
| dist.live_lines += Block::LINES; | ||
| } | ||
| BlockState::Reusable { unavailable_lines } => { | ||
| dist.live_lines += unavailable_lines as usize; |
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Is this number equivalent to linearly scan the line mark table and manually check the line mark bytes? Probably better to add an assertion to double check. Same as L506.
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I've added an assertion in the latest commit that compares the number of live lines by just iterating the lines in the block and checking the mark table with the number from the block state. Is that what you meant?
k-sareen
reviewed
Mar 5, 2024
…tation-immixspace
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Currently we can use the
count_live_bytes_in_gcfeature to check the total fragmentation of the heap, by counting the bytes of all objects that are scanned and dividing that by the total number of pages used by MMTk.I have introduced a new feature
dump_memory_statswhich at the moment, simply print some stats about memory usage inimmixspace(live bytes, lines, blocks and used pages) andlos(live bytes and used pages). These stats should be useful to investigate heap occupation and fragmentation.