Minchan Kim c01ce3b5ef ANDROID: mm: do not try test_page_isoalte if migration fails ...

Currently, alloc_contig_range expects that even though a page fails
with -EBUSY from __alloc_contig_migrate_range, it want to check
those failed pages in test_pages_isolated again with hope that
those page would be freed soon so cma allocatoin would be succeeded.
However, it depends on the luck and I found sometimes test_page_isolated
constantly fails at the page repeatedly whenever cma_alloc retried.
Rather than burning out CPU to check the page's status in
test_pages_isolated for GFP_NORETRY allocation, just bail out and
relies on the user what they want to do.
Currently, this option works for only __GFP_NORETRY case for safe
of existing other users.

Bug: 192475091
Signed-off-by: Minchan Kim <minchan@google.com>
Change-Id: I9211452be06960dc7d8f854537e53b3fc5262c8e

2021-07-14 11:54:48 -07:00

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