mm: readahead: make thp readahead conditional to mmap_miss logic

mm: readahead: make thp readahead conditional to mmap_miss logic

Commit 4687fdbb805a ("mm/filemap: Support VM_HUGEPAGE for file mappings")
introduced a special handling for VM_HUGEPAGE mappings: even if the
readahead is disabled, 1 or 2 HPAGE_PMD_ORDER pages are allocated.

This change causes a significant regression for containers with a tight
memory.max limit, if VM_HUGEPAGE is widely used.  Prior to this commit,
mmap_miss logic would eventually lead to the readahead disablement,
effectively reducing the memory pressure in the cgroup.  With this change
the kernel is trying to allocate 1-2 huge pages for each fault, no matter
if these pages are used or not before being evicted, increasing the memory
pressure multi-fold.

To fix the regression, let's make the new VM_HUGEPAGE conditional to the
mmap_miss check, but keep independent from the ra->ra_pages.  This way the
main intention of commit 4687fdbb805a ("mm/filemap: Support VM_HUGEPAGE
for file mappings") stays intact, but the regression is resolved.

The logic behind this changes is simple: even if a user explicitly
requests using huge pages to back the file mapping (using VM_HUGEPAGE
flag), under a very strong memory pressure it's better to fall back to
ordinary pages.

Link: https://lkml.kernel.org/r/20251006175106.377411-1-roman.gushchin@linux.dev
Fixes: 4687fdbb805a ("mm/filemap: Support VM_HUGEPAGE for file mappings")
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>