[PATCHv3 19/41] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
From: Kirill A. Shutemov <hidden>
Date: 2016-09-15 11:55:01
Also in:
linux-ext4, linux-fsdevel, linux-mm, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
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 <redacted> --- include/linux/bio.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 23ddf4b46a9b..ebf4f312a642 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h@@ -40,7 +40,11 @@ #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