could you tell the call flow of pg state migration from log

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2014-08-11 10:17:04.591497 7f0ec9b4f7a0 10 osd.0 pg_epoch: 153 pg[5.63( empty local-les=153 n=0 ec=81 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] null
2014-08-11 10:17:04.591501 7f0eb2b8f700  5 osd.0 pg_epoch: 155 pg[0.10( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] enter Started
2014-08-11 10:17:04.591501 7f0ec9b4f7a0 10 osd.0 pg_epoch: 153 pg[2.65( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] null
2014-08-11 10:17:04.591505 7f0eb2b8f700  5 osd.0 pg_epoch: 155 pg[0.10( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] enter Start
2014-08-11 10:17:04.591508 7f0ec9b4f7a0 10 osd.0 pg_epoch: 153 pg[1.66( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] null
2014-08-11 10:17:04.591509 7f0eb2b8f700  1 osd.0 pg_epoch: 155 pg[0.10( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] state<Start>: transitioning to Primary
2014-08-11 10:17:04.591513 7f0ec9b4f7a0 10 osd.0 pg_epoch: 153 pg[3.64( empty local-les=153 n=0 ec=76 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] null
2014-08-11 10:17:04.591517 7f0ec9b4f7a0 10 osd.0 pg_epoch: 153 pg[4.63( empty local-les=153 n=0 ec=79 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] null
2014-08-11 10:17:04.591518 7f0eb2b8f700  5 osd.0 pg_epoch: 155 pg[0.10( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] exit Start 0.000013 0 0.000000
2014-08-11 10:17:04.591521 7f0ec9b4f7a0 10 osd.0 pg_epoch: 153 pg[4.6c( empty local-les=153 n=0 ec=79 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] null
2014-08-11 10:17:04.591524 7f0eb2b8f700  5 osd.0 pg_epoch: 155 pg[0.10( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] enter Started/Primary
2014-08-11 10:17:04.591526 7f0ec9b4f7a0 10 osd.0 pg_epoch: 153 pg[1.68( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] null
2014-08-11 10:17:04.591529 7f0eb2b8f700  5 osd.0 pg_epoch: 155 pg[0.10( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] enter Started/Primary/Peering
2014-08-11 10:17:04.591531 7f0ec9b4f7a0 10 osd.0 pg_epoch: 153 pg[1.6b( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 inactive] null
2014-08-11 10:17:04.591535 7f0eb2b8f700  5 osd.0 pg_epoch: 155 pg[0.10( empty local-les=153 n=0 ec=1 les/c 153/153 152/152/152) [0] r=0 lpr=153 crt=0'0 mlcod 0'0 peering] enter Started/Primary/Peering/GetInfo
 
hi,all
pg's state changes ,  Start --> Started/Primary....-> Started/Primary/Peering/GetInfo .
why is that?  what makes it do such change, and it is which thread handles the change? the code
 
 
thanks
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