Hi, Problem: nr_overcommit_hugepages for 1gb hugepage went crazy. Symptom: 1) setup 1gb hugepages. # cat /proc/cmdline default_hugepagesz=1g hugepagesz=1g hugepages=1 # cat /proc/meminfo ... HugePages_Total: 1 HugePages_Free: 1 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 1048576 kB ... 2) set nr_overcommit_hugepages # echo 1 >/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_overcommit_hugepages # cat /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_overcommit_hugepages 1 3) overcommit 2gb hugepages. mmap(NULL, 18446744071562067968, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = -1 ENOMEM (Cannot allocate memory) # cat /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_overcommit_hugepages 18446744071589420672 As you can see from the above, it did not allow overcommit despite nr_overcommit_hugepages value. Also, nr_overcommit_hugepages was overwritten with such a strange value after overcommit failure. Should we just remove this file from sysfs for simplicity? Thanks. CAI Qian -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>