Closed
Bug 610982
Opened 14 years ago
Closed 6 years ago
consolidate page maps into gcheap
Categories
(Tamarin Graveyard :: Garbage Collection (mmGC), enhancement)
Tamarin Graveyard
Garbage Collection (mmGC)
Tracking
(Not tracked)
RESOLVED
WONTFIX
Future
People
(Reporter: pnkfelix, Unassigned)
References
Details
In Bug 445780, comment 7, Lars suggested the following:
Thus IMO the design we may be looking for here is a generic
design in GCHeap that sparsely stores information about
every page allocated by GCHeap, and which can be queried
about any pointer in the address space. If the page is
assigned to a GC it needs to be able to extract a pointer
to the GC that owns it; if it is assigned to FixedMalloc it
should be possible to figure out whether it's a large-block
or small-block page, etc. Right now we're storing per-block
information in the block itself but with such a global data
structure we could reconsider that, esp if it is fast enough
and if the storage can be more efficient (eg if multiple
pages with the same attributes can share one information
blob). Information sharing in this table is in fact
something that is appealing, the current structure in GCHeap
appears to me to be a little profligate in its use of memory.
I investigated this a little bit; its not clear whether we could implement such a structure with such information blob sharing with the current API. It still might be a worthwhile task, if we are willing to revise the API accordingly. Not a short term priority though.
Reporter | ||
Comment 1•14 years ago
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Note that one hypothesized benefit (Bug 445780, comment 7) of such a revision is that FixedMalloc's page-ownership queries could be sped up with such consolidation. This is important because debug builds are known to have issues when run on e.g. the ATS test suite due to the current overhead of those queries.
Updated•14 years ago
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Target Milestone: --- → Future
Comment 2•6 years ago
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Tamarin is a dead project now. Mass WONTFIX.
Status: NEW → RESOLVED
Closed: 6 years ago
Resolution: --- → WONTFIX
Comment 3•6 years ago
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Tamarin isn't maintained anymore. WONTFIX remaining bugs.
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Description
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