From 87e7e1b2ecf895494ad3aa95a62e6a50ecd11dd0 Mon Sep 17 00:00:00 2001 From: Lee Susman Date: Tue, 8 Oct 2013 09:47:59 +0300 Subject: [PATCH] mm: change max readahead size to 512KB Change the VM_MAX_READAHEAD value from the default 128KB to 512KB. This will allow the readahead window to grow to a maximum size of 512KB, which greatly benefits to sequential read throughput. Change-Id: Ia0780ea4e2a4ae0b6111485b72fb25376dcb1f96 Signed-off-by: Lee Susman [vinmenon@codeaurora.org: switch to VM_READAHEAD_PAGES on 5.4] Signed-off-by: Vinayak Menon --- include/linux/mm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index ef6de62a42a8..07ff4efa268a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2542,7 +2542,7 @@ int __must_check write_one_page(struct page *page); void task_dirty_inc(struct task_struct *tsk); /* readahead.c */ -#define VM_READAHEAD_PAGES (SZ_128K / PAGE_SIZE) +#define VM_READAHEAD_PAGES (SZ_512K / PAGE_SIZE) int force_page_cache_readahead(struct address_space *mapping, struct file *filp, pgoff_t offset, unsigned long nr_to_read);