ZacharyZcR
32 lines
1.0 KiB
C
32 lines
1.0 KiB
C
#ifndef COLIBRI_TIER_H
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#define COLIBRI_TIER_H
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#include <stdint.h>
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/* Pick one RAM/VRAM hot-store slot to replace from recent routing heat.
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* The fixed margin handles tiny samples; the 25% margin prevents ping-pong. */
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static int tier_pick_swap(const uint32_t *heat, int nexpert,
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const int *pinned, int npin,
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int *slot, int *eid, long *gain){
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if(!heat || !pinned || npin<1 || nexpert<1) return 0;
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int cold=0;
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for(int z=1;z<npin;z++) if(heat[pinned[z]]<heat[pinned[cold]]) cold=z;
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int hot=-1; uint32_t fh=0;
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for(int e=0;e<nexpert;e++){
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int resident=0;
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for(int z=0;z<npin;z++) if(pinned[z]==e){ resident=1; break; }
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if(!resident && heat[e]>fh){ fh=heat[e]; hot=e; }
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}
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if(hot<0) return 0;
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uint32_t fc=heat[pinned[cold]];
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if(fh<=fc+(fc>>2)+4) return 0;
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*slot=cold; *eid=hot; *gain=(long)fh-(long)fc;
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return 1;
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}
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static void tier_decay(uint32_t *heat, int nexpert){
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for(int e=0;e<nexpert;e++) heat[e]>>=1;
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}
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#endif
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