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VM Maker: VMMaker.oscog-eem.2164.mcz

commits-2
 
Eliot Miranda uploaded a new version of VMMaker to project VM Maker:
http://source.squeak.org/VMMaker/VMMaker.oscog-eem.2164.mcz

==================== Summary ====================

Name: VMMaker.oscog-eem.2164
Author: eem
Time: 17 March 2017, 3:25:47.069439 pm
UUID: 9515d45f-e395-4990-a90e-487ef4657bf1
Ancestors: VMMaker.oscog-eem.2163

Fix the determination of how much to free for the SistaMethodZone.

=============== Diff against VMMaker.oscog-eem.2163 ===============

Item was added:
+ ----- Method: CogMethodZone>>effectiveLimit (in category 'allocating') -----
+ effectiveLimit
+ <inline: true>
+ ^limitAddress!

Item was changed:
  ----- Method: CogMethodZone>>freeOlderMethodsForCompaction (in category 'compaction') -----
  freeOlderMethodsForCompaction
  "Free methods, preferring older methods for compaction, up to some fraction, currently a quarter."
  | zoneSize amountToFree initialFreeSpace freedSoFar freeableUsage cogMethod |
  <var: #cogMethod type: #'CogMethod *'>
+ zoneSize := self effectiveLimit - baseAddress.
+ initialFreeSpace := self effectiveLimit - mzFreeStart + methodBytesFreedSinceLastCompaction.
- zoneSize := limitAddress - baseAddress.
- initialFreeSpace := limitAddress - mzFreeStart + methodBytesFreedSinceLastCompaction.
  freedSoFar := initialFreeSpace.
  amountToFree := zoneSize // 4. "4 needs to be e.g. a start-up parameter"
  freeableUsage := 0.
  [self cCode: ''
  inSmalltalk: [coInterpreter transcript nextPutAll: 'freeing methods with usage '; print: freeableUsage; cr; flush].
  cogMethod := cogit cCoerceSimple: baseAddress to: #'CogMethod *'.
  [cogMethod asUnsignedInteger < mzFreeStart
   and: [freedSoFar < amountToFree]] whileTrue:
  [(self shouldFreeMethod: cogMethod given: freeableUsage) ifTrue:
  [self freeMethod: cogMethod.
  freedSoFar := freedSoFar + cogMethod blockSize].
  cogMethod := self methodAfter: cogMethod].
  freedSoFar < amountToFree
  and: [(freeableUsage := freeableUsage + 1) < CMMaxUsageCount]] whileTrue.
  self cCode: ''
  inSmalltalk: [coInterpreter transcript
  nextPutAll: 'Compaction freeing '; print: freedSoFar;
  nextPutAll: ' of '; print: zoneSize;
  nextPutAll: ' (target: '; print: amountToFree;
  nextPutAll: ' (newly freed: '; print: freedSoFar - initialFreeSpace;
  cr; flush]!

Item was added:
+ ----- Method: SistaMethodZone>>effectiveLimit (in category 'allocating') -----
+ effectiveLimit
+ <inline: true>
+ ^super effectiveLimit min: allocationThreshold!

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