Hello,
I am trying some experiments with libhugetlbfs library. I want to fit
the text section of my executable in a hugepage. I also want to put
any other dependent library function (like printf, scanf etc) in
hugepage. So, I am trying to statically compile my binary.
But, I am not able to get it running. Any help on how to statically
compile programs with libhugetlbfs and get it running will be great, I
am struggling for two weeks now.
// a.c ------ Program ------
#include<stdio.h>
int main() {
int a[1000000] = {1};
scanf("%d", &a[0]); // Just so that I can analyse pmaps
return 0;
}
//-------------End--------
Compilation Command:
$ gcc -c -o a.o a.c
$ gcc -static --verbose -B/usr/local/share/libhugetlbfs
-L/usr/local/lib -Wl,--hugetlbfs-align -o static.out a.o
-Wl,--no-as-needed -lpthread -Wl,--whole-archive -lhugetlbfs
-Wl,--no-whole-archive
-------------------------
Trying to run using :
$ sudo hugectl --verbose 99 --text --no-preload ./static.out hugectl: INFO:
LD_PRELOAD disabled hugectl: INFO: HUGETLB_DEBUG='yes' hugectl: INFO:
HUGETLB_VERBOSE='99' hugectl: INFO:
LD_LIBRARY_PATH='/usr/local/lib:/usr/local/lib64:' hugectl: INFO:
HUGETLB_ELFMAP='R' libhugetlbfs [p-Standard-PC-i440FX-PIIX-1996:4292]:
INFO: Found pagesize 2048 kB libhugetlbfs
[p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: Detected page sizes:
libhugetlbfs [p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: Size: 2048 kB
(default) Mount: /dev/hugepages libhugetlbfs
[p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: Parsed kernel version: [4] .
[3] . [0] libhugetlbfs [p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: Feature
private_reservations is present in this kernel libhugetlbfs
[p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: Feature noreserve_safe is
present in this kernel libhugetlbfs [p-Standard-PC-i440FX-PIIX-1996:4292]:
INFO: Feature map_hugetlb is present in this kernel libhugetlbfs
[p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: Kernel has MAP_PRIVATE
reservations. Disabling heap prefaulting. libhugetlbfs
[p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: Kernel supports MAP_HUGETLB
libhugetlbfs [p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: HUGETLB_SHARE=0,
sharing disabled libhugetlbfs [p-Standard-PC-i440FX-PIIX-1996:4292]: INFO:
HUGETLB_NO_RESERVE=no, reservations enabled libhugetlbfs
[p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: Segment 0 (phdr 0):
0x8000000-0x81042f1 (filesz=0x1042f1) (prot = 0x5) libhugetlbfs
[p-Standard-PC-i440FX-PIIX-1996:4292]: DEBUG: Total memsz = 0x1042f1, memsz
of largest segment = 0x1042f1 libhugetlbfs
[p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: libhugetlbfs version: 2.20
libhugetlbfs [p-Standard-PC-i440FX-PIIX-1996:4293]: INFO: Mapped hugeseg at
0xf7400000. Copying 0x1042f1 bytes and 0 extra bytes from 0x8000000...done
libhugetlbfs [p-Standard-PC-i440FX-PIIX-1996:4292]: INFO: Prepare succeeded
<segfault>
---------------------------------------------------------
Core was generated by `./static.out'. Program terminated with signal
SIGSEGV, Segmentation fault. #0 0x08081c25 in munmap () (gdb) bt #0
0x08081c25 in munmap () #1 0x0804b743 in remap_segments (seg=<optimized
out>, num=<optimized out>) at elflink.c:1122 #2
__lh_hugetlbfs_setup_elflink () at elflink.c:1332 #3 0x08048921 in
setup_libhugetlbfs () at init.c:36 #4 0x080528cd in __libc_csu_init () #5
0x0805240e in __libc_start_main () #6 0x08048b6e in _start ()
$ uname -a Linux p-Standard-PC-i440FX-PIIX-1996 4.3.0+ #12 SMP Tue Mar 8
20:46:38 EST 2016 x86_64 x86_64 x86_64 GNU/Linux
---------------
If any more information is needed please tell.
Please help.
Thanks,
Parag Gupta,
MS Graduate Student,
Department of Computer Science,
Stony Brook University - NY
------------------------------------------------------------------------------
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