When a process triggers a page fault and kernel keeps trying to retry the fault, there is no chance for this process to be frozen, so the freeze request will always be pending.
This patch lets the page fault handler check pending freeze request and freeze current process if so. Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: David Rientjes <[email protected]> Cc: Michal Hocko <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Andrew Morton <[email protected]> Signed-off-by: Cong Wang <[email protected]> --- arch/x86/mm/fault.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index a241946..ad9728a 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -14,6 +14,7 @@ #include <linux/hugetlb.h> /* hstate_index_to_shift */ #include <linux/prefetch.h> /* prefetchw */ #include <linux/context_tracking.h> /* exception_enter(), ... */ +#include <linux/freezer.h> /* try_to_freeze() */ #include <asm/traps.h> /* dotraplinkage, ... */ #include <asm/pgalloc.h> /* pgd_*(), ... */ @@ -885,6 +886,9 @@ mm_fault_error(struct pt_regs *regs, unsigned long error_code, up_read(¤t->mm->mmap_sem); no_context(regs, error_code, address, 0, 0); return; + } else if (signal_pending(current) && (error_code & PF_USER)) { + if (try_to_freeze()) + return; } if (fault & VM_FAULT_OOM) { -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
