当主线程状态是“制作检查点”时，mysql实际上在做什么？

I've noticed that mysql (5.0.60) often freezes for up to minutes at a time under load, during which time the server is completely non-responsive. I've been able to isolate this to only happening when innotop shows the main thread state as "making checkpoint".I've noticed that mysql (5.0.60) often freezes