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Groups > linux.kernel > #1253515

[PATCH 2/5] dax: increase granularity of dax_clear_blocks() operations

From Dan Williams <dan.j.williams@intel.com>
Newsgroups linux.kernel
Subject [PATCH 2/5] dax: increase granularity of dax_clear_blocks() operations
Date 2015-10-22 08:50 +0200
Message-ID <qmhRg-2Ly-29@gated-at.bofh.it> (permalink)
References <qmhRf-2Ly-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

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dax_clear_blocks is currently performing a cond_resched() after every
PAGE_SIZE memset.  We need not check so frequently, for example md-raid
only calls cond_resched() at stripe granularity.  Also, in preparation
for introducing a dax_map_atomic() operation that temporarily pins a dax
mapping move the call to cond_resched() to the outer loop.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 fs/dax.c |   27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 5dc33d788d50..f8e543839e5c 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -28,6 +28,7 @@
 #include <linux/sched.h>
 #include <linux/uio.h>
 #include <linux/vmstat.h>
+#include <linux/sizes.h>
 
 int dax_clear_blocks(struct inode *inode, sector_t block, long size)
 {
@@ -38,24 +39,20 @@ int dax_clear_blocks(struct inode *inode, sector_t block, long size)
 	do {
 		void __pmem *addr;
 		unsigned long pfn;
-		long count;
+		long count, sz;
 
-		count = bdev_direct_access(bdev, sector, &addr, &pfn, size);
+		sz = min_t(long, size, SZ_1M);
+		count = bdev_direct_access(bdev, sector, &addr, &pfn, sz);
 		if (count < 0)
 			return count;
-		BUG_ON(size < count);
-		while (count > 0) {
-			unsigned pgsz = PAGE_SIZE - offset_in_page(addr);
-			if (pgsz > count)
-				pgsz = count;
-			clear_pmem(addr, pgsz);
-			addr += pgsz;
-			size -= pgsz;
-			count -= pgsz;
-			BUG_ON(pgsz & 511);
-			sector += pgsz / 512;
-			cond_resched();
-		}
+		if (count < sz)
+			sz = count;
+		clear_pmem(addr, sz);
+		addr += sz;
+		size -= sz;
+		BUG_ON(sz & 511);
+		sector += sz / 512;
+		cond_resched();
 	} while (size);
 
 	wmb_pmem();

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Thread

[PATCH 0/5] block, dax: updates for 4.4 Dan Williams <dan.j.williams@intel.com> - 2015-10-22 08:50 +0200
  [PATCH 2/5] dax: increase granularity of dax_clear_blocks()  operations Dan Williams <dan.j.williams@intel.com> - 2015-10-22 08:50 +0200
    Re: [PATCH 2/5] dax: increase granularity of dax_clear_blocks()  operations Jan Kara <jack@suse.cz> - 2015-10-22 11:30 +0200
  [PATCH 5/5] block: enable dax for raw block devices Dan Williams <dan.j.williams@intel.com> - 2015-10-22 08:50 +0200
    Re: [PATCH 5/5] block: enable dax for raw block devices Jan Kara <jack@suse.cz> - 2015-10-22 11:40 +0200
      Re: [PATCH 5/5] block: enable dax for raw block devices "Williams, Dan J" <dan.j.williams@intel.com> - 2015-10-22 18:10 +0200
        Re: [PATCH 5/5] block: enable dax for raw block devices Jan Kara <jack@suse.cz> - 2015-10-22 23:10 +0200
          Re: [PATCH 5/5] block: enable dax for raw block devices "Williams, Dan J" <dan.j.williams@intel.com> - 2015-10-23 01:50 +0200
            Re: [PATCH 5/5] block: enable dax for raw block devices Jan Kara <jack@suse.cz> - 2015-10-24 16:30 +0200
          Re: [PATCH 5/5] block: enable dax for raw block devices Dan Williams <dan.j.williams@intel.com> - 2015-10-24 01:40 +0200
            Re: [PATCH 5/5] block: enable dax for raw block devices Jan Kara <jack@suse.cz> - 2015-10-24 16:50 +0200
          Re: [PATCH 5/5] block: enable dax for raw block devices Dave Chinner <david@fromorbit.com> - 2015-10-25 22:30 +0100
            Re: [PATCH 5/5] block: enable dax for raw block devices Dan Williams <dan.j.williams@intel.com> - 2015-10-26 03:50 +0100
              Re: [PATCH 5/5] block: enable dax for raw block devices Dave Chinner <david@fromorbit.com> - 2015-10-26 07:30 +0100
                Re: [PATCH 5/5] block: enable dax for raw block devices Jan Kara <jack@suse.cz> - 2015-10-26 08:30 +0100
                Re: [PATCH 5/5] block: enable dax for raw block devices Dan Williams <dan.j.williams@intel.com> - 2015-10-26 10:00 +0100
                Re: [PATCH 5/5] block: enable dax for raw block devices Dave Chinner <david@fromorbit.com> - 2015-10-26 23:30 +0100
                Re: [PATCH 5/5] block: enable dax for raw block devices Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-10-28 00:00 +0100

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