From: "Kirill A. Shutemov" Subject: [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled Date: Tue, 25 Oct 2016 03:13:17 +0300 Message-ID: <20161025001342.76126-19-kirill.shutemov@linux.intel.com> References: <20161025001342.76126-1-kirill.shutemov@linux.intel.com> Cc: Alexander Viro , Hugh Dickins , Andrea Arcangeli , Dave Hansen , Vlastimil Babka , Matthew Wilcox , Ross Zwisler , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org, "Kirill A. Shutemov" To: "Theodore Ts'o" , Andreas Dilger , Jan Kara , Andrew Morton Return-path: In-Reply-To: <20161025001342.76126-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org We are going to do IO a huge page a time. So we need BIO_MAX_PAGES to be at least HPAGE_PMD_NR. For x86-64, it's 512 pages. Signed-off-by: Kirill A. Shutemov --- block/bio.c | 3 ++- include/linux/bio.h | 4 ++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/block/bio.c b/block/bio.c index db85c5753a76..a69062bda3e0 100644 --- a/block/bio.c +++ b/block/bio.c @@ -44,7 +44,8 @@ */ #define BV(x) { .nr_vecs = x, .name = "biovec-"__stringify(x) } static struct biovec_slab bvec_slabs[BVEC_POOL_NR] __read_mostly = { - BV(1), BV(4), BV(16), BV(64), BV(128), BV(BIO_MAX_PAGES), + BV(1), BV(4), BV(16), BV(64), BV(128), + { .nr_vecs = BIO_MAX_PAGES, .name ="biovec-max_pages" }, }; #undef BV diff --git a/include/linux/bio.h b/include/linux/bio.h index 97cb48f03dc7..19d0fae9cdd0 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -38,7 +38,11 @@ #define BIO_BUG_ON #endif +#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE +#define BIO_MAX_PAGES (HPAGE_PMD_NR > 256 ? HPAGE_PMD_NR : 256) +#else #define BIO_MAX_PAGES 256 +#endif #define bio_prio(bio) (bio)->bi_ioprio #define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio) -- 2.9.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org