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* always keep 1 free os chunk available in the freelist to avoid

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a performance killing corner case where one block is constantly allocated
    and freed and can result in a redividing of an os chunk in small parts
    for each allocation

git-svn-id: trunk@1900 -
This commit is contained in:
Jonas Maebe 2005-12-07 20:01:15 +00:00
parent 7996bb3b06
commit 31b173fe85
1 changed files with 9 additions and 2 deletions
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11
rtl/inc/heap.inc
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@ -131,6 +131,7 @@ var
internal_status : TFPCHeapStatus; internal_status : TFPCHeapStatus;
freelists_fixed : tfreelists; freelists_fixed : tfreelists;
freelists_free_chunk : array[1..maxblockindex] of boolean;
freelist_var : pmemchunk_var; freelist_var : pmemchunk_var;
freeoslist : poschunk; freeoslist : poschunk;
freeoslistcount : dword; freeoslistcount : dword;
@ -902,6 +903,8 @@ begin
if assigned(freelists_fixed[s]) then if assigned(freelists_fixed[s]) then
freelists_fixed[s]^.prev_fixed := nil; freelists_fixed[s]^.prev_fixed := nil;
poc := poschunk(pointer(pcurr)-((pcurr^.size shr 16)*(pcurr^.size and fixedsizemask)+sizeof(toschunk))); poc := poschunk(pointer(pcurr)-((pcurr^.size shr 16)*(pcurr^.size and fixedsizemask)+sizeof(toschunk)));
if (poc^.used = 0) then
freelists_free_chunk[s] := false;
inc(poc^.used); inc(poc^.used);
{ statistics } { statistics }
inc(internal_status.currheapused,size); inc(internal_status.currheapused,size);
@ -1029,8 +1032,11 @@ begin
dec(poc^.used); dec(poc^.used);
if poc^.used = 0 then if poc^.used = 0 then
begin begin
// block eligable for freeing if (freelists_free_chunk[blockindex]) then
append_to_oslist_fixed(blockindex, pcurrsize, poc); // block eligable for freeing
append_to_oslist_fixed(blockindex, pcurrsize, poc)
else
freelists_free_chunk[blockindex] := true;
end; end;
SysFreeMem_Fixed := pcurrsize; SysFreeMem_Fixed := pcurrsize;
{$ifdef TestFreeLists} {$ifdef TestFreeLists}
@ -1311,6 +1317,7 @@ end;
procedure InitHeap; procedure InitHeap;
begin begin
FillChar(freelists_fixed,sizeof(tfreelists),0); FillChar(freelists_fixed,sizeof(tfreelists),0);
FillChar(freelists_free_chunk,sizeof(freelists_free_chunk),0);
freelist_var := nil; freelist_var := nil;
freeoslist := nil; freeoslist := nil;
freeoslistcount := 0; freeoslistcount := 0;