From 13f966373f9296c0da2fb2764654cce520b3a6b4 Mon Sep 17 00:00:00 2001 From: "Dennis Zhou (Facebook)" Date: Mon, 24 Jul 2017 19:02:14 -0400 Subject: percpu: skip chunks if the alloc does not fit in the contig hint This patch adds chunk->contig_bits_start to keep track of the contig hint's offset and the check to skip the chunk if it does not fit. If the chunk's contig hint starting offset cannot satisfy an allocation, the allocator assumes there is enough memory pressure in this chunk to either use a different chunk or create a new one. This accepts a less tight packing for a smoother latency curve. Signed-off-by: Dennis Zhou Reviewed-by: Josef Bacik Signed-off-by: Tejun Heo --- mm/percpu-internal.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'mm/percpu-internal.h') diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h index e60e04966d96..7065faf74b46 100644 --- a/mm/percpu-internal.h +++ b/mm/percpu-internal.h @@ -29,6 +29,8 @@ struct pcpu_chunk { struct list_head list; /* linked to pcpu_slot lists */ int free_bytes; /* free bytes in the chunk */ int contig_bits; /* max contiguous size hint */ + int contig_bits_start; /* contig_bits starting + offset */ void *base_addr; /* base address of this chunk */ unsigned long *alloc_map; /* allocation map */ -- cgit