[LU-16609] top_trans_create() can oom due to the gfp flags

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.16.0
• Labels: patch
• Severity: 3
• Assignee: Andrew Perepechko
• Reporter: Andrew Perepechko

Description

top_trans_create() requests __GFP_IO memory allocation,
which does not allow direct reclaim. However, if the
memory shortage is temporary, direct reclaim is reasonable.

GFP_NOFS is __GFP_IO with some additional reclaim bits.