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mm, hugetlb: add thread name and pid to SHM_HUGETLB mlock rlimit warning

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Add the thread name and pid of the application that is allocating shm
segments with MAP_HUGETLB without being a part of
/proc/sys/vm/hugetlb_shm_group or having CAP_IPC_LOCK.

This identifies the application so it may be fixed by avoiding using the
deprecated exception (see Documentation/feature-removal-schedule.txt).

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2012-03-21 16:34:13 -07:00 committed by Linus Torvalds
parent ea48cf7863
commit 21a3c273f8
1 changed files with 5 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
fs/hugetlbfs/inode.c
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@ -953,7 +953,11 @@ struct file *hugetlb_file_setup(const char *name, size_t size,
if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) {
*user = current_user();
if (user_shm_lock(size, *user)) {
printk_once(KERN_WARNING "Using mlock ulimits for SHM_HUGETLB is deprecated\n");
task_lock(current);
printk_once(KERN_WARNING
"%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n",
current->comm, current->pid);
task_unlock(current);
} else {
*user = NULL;
return ERR_PTR(-EPERM);