Hi,
I've been poking around at the libhugetlbfs testcases and there are a
small number of failures that I can't figure out. The primary one is
the malloc test. From all appearances, it seems that the custom
hugetlbfs_morecore function isn't getting called when the test calls
malloc, and it fails because the page wasn't allocated from the
hugepages. You can see below that the INFO call in the
hugetlbfs_morecore function never prints anything:
[jwboyer@zod obj64]$ sudo
LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:../../obj64/
LD_PRELOAD=../../obj64/libhugetlbfs.so HUGETLB_MORECORE=yes
HUGETLB_VERBOSE=4 ./malloc
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Found pagesize 2048 kB
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Parsed kernel version:
[3] . [3] . [7]
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Feature
private_reservations is present in this kernel
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Feature noreserve_safe
is present in this kernel
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Feature map_hugetlb is
present in this kernel
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Kernel has MAP_PRIVATE
reservations. Disabling heap prefaulting.
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Kernel supports MAP_HUGETLB
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: HUGETLB_SHARE=0, sharing disabled
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: HUGETLB_NO_RESERVE=no,
reservations enabled
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: No segments were
appropriate for remapping
libhugetlbfs [zod.bos.redhat.com:22061]: INFO: setup_morecore():
heapaddr = 0xe00000
Starting testcase "./malloc", pid 22061
HUGETLB_MORECORE=yes
HUGETLB_RESTRICT_EXE=(null)
expect_hugepage=1
malloc(4) = 0xd89010
FAIL Address is not hugepage
[jwboyer@zod obj64]$
This is with the latest git head of libhugetlbfs, and I have 32
hugepages setup and free:
[jwboyer@zod glibc]$ grep Huge /proc/meminfo
AnonHugePages: 299008 kB
HugePages_Total: 32
HugePages_Free: 32
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
[jwboyer@zod glibc]$
I ran the test in gdb as well, and my breakpoint on hugetlbfs_morecore
never triggered after main was started. Perhaps this is a side-effect
of glibc already having pre-allocated heap from arenas?
Has anyone else seen this?
josh
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