From 70c8205f40a385383b0c81f59550cf27273bf912 Mon Sep 17 00:00:00 2001 From: Richard Weinberger Date: Sun, 25 Oct 2015 22:26:09 +0100 Subject: [PATCH] um: Report host OOM more nicely If UML runs on the host side out of memory, report this condition more nicely. Signed-off-by: Richard Weinberger --- arch/um/kernel/tlb.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c index 2077248e8a72..3777b82759bd 100644 --- a/arch/um/kernel/tlb.c +++ b/arch/um/kernel/tlb.c @@ -50,6 +50,13 @@ struct host_vm_change { .index = 0, \ .force = force }) +static void report_enomem(void) +{ + printk(KERN_ERR "UML ran out of memory on the host side! " + "This can happen due to a memory limitation or " + "vm.max_map_count has been reached.\n"); +} + static int do_ops(struct host_vm_change *hvc, int end, int finished) { @@ -81,6 +88,9 @@ static int do_ops(struct host_vm_change *hvc, int end, } } + if (ret == -ENOMEM) + report_enomem(); + return ret; } @@ -433,8 +443,12 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long address) else if (pte_newprot(*pte)) err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush); - if (err) + if (err) { + if (err == -ENOMEM) + report_enomem(); + goto kill; + } *pte = pte_mkuptodate(*pte); -- 2.34.1