My application is using remap_file_pages and mlocks
those pages.
So in the code of try_to_unmap_file (see below),
I should never reach the call to try_to_unmap_cluster,
because for those pages VM_LOCKED is always set.
But, under heavy load I am seeing try_to_unmap_cluster
is getting called. Stack:
try_to_unmap_cluster
try_to_unmap_file
try_to_unmap
shrink_list
__pagevec_release
shrink_cache
shrink_zone
balance_pgdat
prepare_to_wait
kswapd
Any idea why VM_LOCKED is not being respected ?
do {
list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
shared.vm_set.list) {
if (vma->vm_flags & (VM_LOCKED|VM_RESERVED))
continue;
cursor = (unsigned long) vma->vm_private_data;
while (vma->vm_mm->rss &&
cursor < max_nl_cursor &&
cursor < vma->vm_end - vma->vm_start) {
try_to_unmap_cluster(cursor, &mapcount, vma);
cursor += CLUSTER_SIZE;
}
.....<snip>
} while (max_nl_cursor <= max_nl_size);
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