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mm/util.c: add warning if __vm_enough_memory fails

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If a process has not enough memory to allocate a new virtual mapping, we
may meet verious kinds of error, eg, fork cannot allocate memory, SIGBUS
error in shmem, but it is difficult to confirm them, let's add some debug
information to easily to check this scenario if __vm_enough_memory fails.

Link: https://lkml.kernel.org/r/20220726145428.8030-1-wangkefeng.wang@huawei.com
Reported-by: Yongqiang Liu <liuyongqiang13@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2022-07-26 22:54:28 +08:00 committed by Andrew Morton
parent 4d86d4f722
commit 44b414c871
1 changed files with 2 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
mm/util.c
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@ -1052,6 +1052,8 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
if (percpu_counter_read_positive(&vm_committed_as) < allowed) if (percpu_counter_read_positive(&vm_committed_as) < allowed)
return 0; return 0;
error: error:
pr_warn_ratelimited("%s: pid: %d, comm: %s, no enough memory for the allocation\n",
__func__, current->pid, current->comm);
vm_unacct_memory(pages); vm_unacct_memory(pages);
return -ENOMEM; return -ENOMEM;