When we use the -e or --extended_fields option, compactsnoop.py will output some error information. The root cause is that we obtained zone and wmark information but did not update it to the hash table.
before the patch:
./compactsnoop.py -e and echo 1 > /proc/sys/vm/compact_memory
COMM PID NODE ZONE ORDER MODE FRAGIDX MIN LOW HIGH FREE LAT(ms) STATUS
bash 32559 0 ZONE_DMA 0 SYNC -1.000 0 0 0 0 0.031 complete
bash 32559 0 ZONE_DMA 0 SYNC -1.000 0 0 0 0 3.849 complete
bash 32559 0 ZONE_DMA 0 SYNC -1.000 0 0 0 0 67.697 complete
after the patch:
./compactsnoop.py -e and echo 1 > /proc/sys/vm/compact_memory
COMM PID NODE ZONE ORDER MODE FRAGIDX MIN LOW HIGH FREE LAT(ms) STATUS
bash 32559 0 ZONE_DMA -1 SYNC -1.000 1 4 7 2816 0.033 complete
bash 32559 0 ZONE_DMA32 -1 SYNC -1.000 218 642 1066 428437 3.850 complete
bash 32559 0 ZONE_NORMAL -1 SYNC -1.000 16675 49142 81609 21707362 62.608 complete
When we use the -e or --extended_fields option, compactsnoop.py will output some error information. The root cause is that we obtained zone and wmark information but did not update it to the hash table.
before the patch:
./compactsnoop.py -e and echo 1 > /proc/sys/vm/compact_memory COMM PID NODE ZONE ORDER MODE FRAGIDX MIN LOW HIGH FREE LAT(ms) STATUS bash 32559 0 ZONE_DMA 0 SYNC -1.000 0 0 0 0 0.031 complete bash 32559 0 ZONE_DMA 0 SYNC -1.000 0 0 0 0 3.849 complete bash 32559 0 ZONE_DMA 0 SYNC -1.000 0 0 0 0 67.697 complete
after the patch:
./compactsnoop.py -e and echo 1 > /proc/sys/vm/compact_memory COMM PID NODE ZONE ORDER MODE FRAGIDX MIN LOW HIGH FREE LAT(ms) STATUS bash 32559 0 ZONE_DMA -1 SYNC -1.000 1 4 7 2816 0.033 complete bash 32559 0 ZONE_DMA32 -1 SYNC -1.000 218 642 1066 428437 3.850 complete bash 32559 0 ZONE_NORMAL -1 SYNC -1.000 16675 49142 81609 21707362 62.608 complete
So let's fix it.