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-rw-r--r--mm/fadvise.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/mm/fadvise.c b/mm/fadvise.c
index 6c707bf..a430131 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -139,7 +139,20 @@ SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice)
}
if (end_index >= start_index) {
- unsigned long count = invalidate_mapping_pages(mapping,
+ unsigned long count;
+
+ /*
+ * It's common to FADV_DONTNEED right after
+ * the read or write that instantiates the
+ * pages, in which case there will be some
+ * sitting on the local LRU cache. Try to
+ * avoid the expensive remote drain and the
+ * second cache tree walk below by flushing
+ * them out right away.
+ */
+ lru_add_drain();
+
+ count = invalidate_mapping_pages(mapping,
start_index, end_index);
/*
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