diff options
| author | Hari Bathini <hbathini@linux.vnet.ibm.com> | 2018-04-10 19:11:31 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-05-03 23:09:25 +1000 |
| commit | 8597538712ebd90bc83dfb0b3b40398a0c53ad5b (patch) | |
| tree | 4181bb1f936224650a0c38e501cbbfdb56f23050 /arch/powerpc/kernel/fadump.c | |
| parent | b71a693d3db3abd1ddf7d29be967a1180c3ebb22 (diff) | |
powerpc/fadump: Do not use hugepages when fadump is active
FADump capture kernel boots in restricted memory environment preserving
the context of previous kernel to save vmcore. Supporting hugepages in
such environment makes things unnecessarily complicated, as hugepages
need memory set aside for them. This means most of the capture kernel's
memory is used in supporting hugepages. In most cases, this results in
out-of-memory issues while booting FADump capture kernel. But hugepages
are not of much use in capture kernel whose only job is to save vmcore.
So, disabling hugepages support, when fadump is active, is a reliable
solution for the out of memory issues. Introducing a flag variable to
disable HugeTLB support when fadump is active.
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/fadump.c')
| -rw-r--r-- | arch/powerpc/kernel/fadump.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index bea8d5fe3b6e..8ceabef40d3d 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -402,6 +402,14 @@ int __init fadump_reserve_mem(void) if (fw_dump.dump_active) { pr_info("Firmware-assisted dump is active.\n"); +#ifdef CONFIG_HUGETLB_PAGE + /* + * FADump capture kernel doesn't care much about hugepages. + * In fact, handling hugepages in capture kernel is asking for + * trouble. So, disable HugeTLB support when fadump is active. + */ + hugetlb_disabled = true; +#endif /* * If last boot has crashed then reserve all the memory * above boot_memory_size so that we don't touch it until |