Hi, I'l like to add fallocate() system call to improve sequential read/write peformance. fallocate() system call is different from posix_fallocate() that is zero-fille algorithm to reserve continues disk space. fallocate() is almost less overhead alogotithm to reserve continues disk space than posix_fallocate().
It will be needed by sorted checkpoint and more faster vacuum command in near the future. If you get more detail information, please see linux manual. I go sight seeing in Dublin with Ishii-san now:-) Regards, -- Mitsumasa KONDO NTT Open Source Software
pg_fallocate_v0.patch
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