The patch titled
mm: bdi: add separate writeback accounting capability
has been added to the -mm tree. Its filename is
mm-bdi-add-separate-writeback-accounting-capability.patch
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------------------------------------------------------
Subject: mm: bdi: add separate writeback accounting capability
From: Miklos Szeredi <mszeredi@xxxxxxx>
Add a new BDI capability flag: BDI_CAP_NO_ACCT_WB. If this flag is
set, then don't update the per-bdi writeback stats from
test_set_page_writeback() and test_clear_page_writeback().
Misc cleanups:
- convert bdi_cap_writeback_dirty() and friends to static inline functions
- create a flag that includes all three dirty/writeback related flags,
since almst all users will want to have them toghether
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
---
Index: linux/fs/configfs/inode.c
===================================================================
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/configfs/inode.c | 2
fs/hugetlbfs/inode.c | 2
fs/ocfs2/dlm/dlmfs.c | 2
fs/ramfs/inode.c | 2
fs/sysfs/inode.c | 2
include/linux/backing-dev.h | 77 +++++++++++++++++++++++++---------
kernel/cgroup.c | 2
mm/page-writeback.c | 4 -
mm/shmem.c | 2
mm/swap_state.c | 2
10 files changed, 67 insertions(+), 30 deletions(-)
diff -puN fs/configfs/inode.c~mm-bdi-add-separate-writeback-accounting-capability fs/configfs/inode.c
--- a/fs/configfs/inode.c~mm-bdi-add-separate-writeback-accounting-capability
+++ a/fs/configfs/inode.c
@@ -47,7 +47,7 @@ static const struct address_space_operat
static struct backing_dev_info configfs_backing_dev_info = {
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
static const struct inode_operations configfs_inode_operations ={
diff -puN fs/hugetlbfs/inode.c~mm-bdi-add-separate-writeback-accounting-capability fs/hugetlbfs/inode.c
--- a/fs/hugetlbfs/inode.c~mm-bdi-add-separate-writeback-accounting-capability
+++ a/fs/hugetlbfs/inode.c
@@ -45,7 +45,7 @@ static const struct inode_operations hug
static struct backing_dev_info hugetlbfs_backing_dev_info = {
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
int sysctl_hugetlb_shm_group;
diff -puN fs/ocfs2/dlm/dlmfs.c~mm-bdi-add-separate-writeback-accounting-capability fs/ocfs2/dlm/dlmfs.c
--- a/fs/ocfs2/dlm/dlmfs.c~mm-bdi-add-separate-writeback-accounting-capability
+++ a/fs/ocfs2/dlm/dlmfs.c
@@ -327,7 +327,7 @@ clear_fields:
static struct backing_dev_info dlmfs_backing_dev_info = {
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
static struct inode *dlmfs_get_root_inode(struct super_block *sb)
diff -puN fs/ramfs/inode.c~mm-bdi-add-separate-writeback-accounting-capability fs/ramfs/inode.c
--- a/fs/ramfs/inode.c~mm-bdi-add-separate-writeback-accounting-capability
+++ a/fs/ramfs/inode.c
@@ -44,7 +44,7 @@ static const struct inode_operations ram
static struct backing_dev_info ramfs_backing_dev_info = {
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK |
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK |
BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY |
BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP,
};
diff -puN fs/sysfs/inode.c~mm-bdi-add-separate-writeback-accounting-capability fs/sysfs/inode.c
--- a/fs/sysfs/inode.c~mm-bdi-add-separate-writeback-accounting-capability
+++ a/fs/sysfs/inode.c
@@ -30,7 +30,7 @@ static const struct address_space_operat
static struct backing_dev_info sysfs_backing_dev_info = {
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
static const struct inode_operations sysfs_inode_operations ={
diff -puN include/linux/backing-dev.h~mm-bdi-add-separate-writeback-accounting-capability include/linux/backing-dev.h
--- a/include/linux/backing-dev.h~mm-bdi-add-separate-writeback-accounting-capability
+++ a/include/linux/backing-dev.h
@@ -12,6 +12,7 @@
#include <linux/log2.h>
#include <linux/proportions.h>
#include <linux/kernel.h>
+#include <linux/fs.h>
#include <asm/atomic.h>
struct page;
@@ -151,22 +152,43 @@ int bdi_set_max_ratio(struct backing_dev
/*
* Flags in backing_dev_info::capability
- * - The first two flags control whether dirty pages will contribute to the
- * VM's accounting and whether writepages() should be called for dirty pages
- * (something that would not, for example, be appropriate for ramfs)
- * - These flags let !MMU mmap() govern direct device mapping vs immediate
- * copying more easily for MAP_PRIVATE, especially for ROM filesystems
+ *
+ * The first three flags control whether dirty pages will contribute to the
+ * VM's accounting and whether writepages() should be called for dirty pages
+ * (something that would not, for example, be appropriate for ramfs)
+ *
+ * WARNING: these flags are closely related and should not normally be
+ * used separately. The BDI_CAP_NO_ACCT_AND_WRITEBACK combines these
+ * three flags into a single convenience macro.
+ *
+ * BDI_CAP_NO_ACCT_DIRTY: Dirty pages shouldn't contribute to accounting
+ * BDI_CAP_NO_WRITEBACK: Don't write pages back
+ * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages
+ *
+ * These flags let !MMU mmap() govern direct device mapping vs immediate
+ * copying more easily for MAP_PRIVATE, especially for ROM filesystems.
+ *
+ * BDI_CAP_MAP_COPY: Copy can be mapped (MAP_PRIVATE)
+ * BDI_CAP_MAP_DIRECT: Can be mapped directly (MAP_SHARED)
+ * BDI_CAP_READ_MAP: Can be mapped for reading
+ * BDI_CAP_WRITE_MAP: Can be mapped for writing
+ * BDI_CAP_EXEC_MAP: Can be mapped for execution
*/
-#define BDI_CAP_NO_ACCT_DIRTY 0x00000001 /* Dirty pages shouldn't contribute to accounting */
-#define BDI_CAP_NO_WRITEBACK 0x00000002 /* Don't write pages back */
-#define BDI_CAP_MAP_COPY 0x00000004 /* Copy can be mapped (MAP_PRIVATE) */
-#define BDI_CAP_MAP_DIRECT 0x00000008 /* Can be mapped directly (MAP_SHARED) */
-#define BDI_CAP_READ_MAP 0x00000010 /* Can be mapped for reading */
-#define BDI_CAP_WRITE_MAP 0x00000020 /* Can be mapped for writing */
-#define BDI_CAP_EXEC_MAP 0x00000040 /* Can be mapped for execution */
+#define BDI_CAP_NO_ACCT_DIRTY 0x00000001
+#define BDI_CAP_NO_WRITEBACK 0x00000002
+#define BDI_CAP_MAP_COPY 0x00000004
+#define BDI_CAP_MAP_DIRECT 0x00000008
+#define BDI_CAP_READ_MAP 0x00000010
+#define BDI_CAP_WRITE_MAP 0x00000020
+#define BDI_CAP_EXEC_MAP 0x00000040
+#define BDI_CAP_NO_ACCT_WB 0x00000080
+
#define BDI_CAP_VMFLAGS \
(BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP)
+#define BDI_CAP_NO_ACCT_AND_WRITEBACK \
+ (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB)
+
#if defined(VM_MAYREAD) && \
(BDI_CAP_READ_MAP != VM_MAYREAD || \
BDI_CAP_WRITE_MAP != VM_MAYWRITE || \
@@ -206,17 +228,32 @@ void clear_bdi_congested(struct backing_
void set_bdi_congested(struct backing_dev_info *bdi, int rw);
long congestion_wait(int rw, long timeout);
-#define bdi_cap_writeback_dirty(bdi) \
- (!((bdi)->capabilities & BDI_CAP_NO_WRITEBACK))
-#define bdi_cap_account_dirty(bdi) \
- (!((bdi)->capabilities & BDI_CAP_NO_ACCT_DIRTY))
+static inline bool bdi_cap_writeback_dirty(struct backing_dev_info *bdi)
+{
+ return !(bdi->capabilities & BDI_CAP_NO_WRITEBACK);
+}
-#define mapping_cap_writeback_dirty(mapping) \
- bdi_cap_writeback_dirty((mapping)->backing_dev_info)
+static inline bool bdi_cap_account_dirty(struct backing_dev_info *bdi)
+{
+ return !(bdi->capabilities & BDI_CAP_NO_ACCT_DIRTY);
+}
-#define mapping_cap_account_dirty(mapping) \
- bdi_cap_account_dirty((mapping)->backing_dev_info)
+static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi)
+{
+ /* Paranoia: BDI_CAP_NO_WRITEBACK implies BDI_CAP_NO_ACCT_WB */
+ return !(bdi->capabilities & (BDI_CAP_NO_ACCT_WB |
+ BDI_CAP_NO_WRITEBACK));
+}
+
+static inline bool mapping_cap_writeback_dirty(struct address_space *mapping)
+{
+ return bdi_cap_writeback_dirty(mapping->backing_dev_info);
+}
+static inline bool mapping_cap_account_dirty(struct address_space *mapping)
+{
+ return bdi_cap_account_dirty(mapping->backing_dev_info);
+}
#endif /* _LINUX_BACKING_DEV_H */
diff -puN kernel/cgroup.c~mm-bdi-add-separate-writeback-accounting-capability kernel/cgroup.c
--- a/kernel/cgroup.c~mm-bdi-add-separate-writeback-accounting-capability
+++ a/kernel/cgroup.c
@@ -551,7 +551,7 @@ static struct inode_operations cgroup_di
static struct file_operations proc_cgroupstats_operations;
static struct backing_dev_info cgroup_backing_dev_info = {
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb)
diff -puN mm/page-writeback.c~mm-bdi-add-separate-writeback-accounting-capability mm/page-writeback.c
--- a/mm/page-writeback.c~mm-bdi-add-separate-writeback-accounting-capability
+++ a/mm/page-writeback.c
@@ -1246,7 +1246,7 @@ int test_clear_page_writeback(struct pag
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_WRITEBACK);
- if (bdi_cap_writeback_dirty(bdi)) {
+ if (bdi_cap_account_writeback(bdi)) {
__dec_bdi_stat(bdi, BDI_WRITEBACK);
__bdi_writeout_inc(bdi);
}
@@ -1275,7 +1275,7 @@ int test_set_page_writeback(struct page
radix_tree_tag_set(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_WRITEBACK);
- if (bdi_cap_writeback_dirty(bdi))
+ if (bdi_cap_account_writeback(bdi))
__inc_bdi_stat(bdi, BDI_WRITEBACK);
}
if (!PageDirty(page))
diff -puN mm/shmem.c~mm-bdi-add-separate-writeback-accounting-capability mm/shmem.c
--- a/mm/shmem.c~mm-bdi-add-separate-writeback-accounting-capability
+++ a/mm/shmem.c
@@ -201,7 +201,7 @@ static struct vm_operations_struct shmem
static struct backing_dev_info shmem_backing_dev_info __read_mostly = {
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
.unplug_io_fn = default_unplug_io_fn,
};
diff -puN mm/swap_state.c~mm-bdi-add-separate-writeback-accounting-capability mm/swap_state.c
--- a/mm/swap_state.c~mm-bdi-add-separate-writeback-accounting-capability
+++ a/mm/swap_state.c
@@ -33,7 +33,7 @@ static const struct address_space_operat
};
static struct backing_dev_info swap_backing_dev_info = {
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
.unplug_io_fn = swap_unplug_io_fn,
};
_
Patches currently in -mm which might be from mszeredi@xxxxxxx are
mm-rotate_reclaimable_page-cleanup.patch
vfs-create-proc-pid-mountinfo.patch
vfs-mountinfo-mm-fix.patch
vfs-pnode-cleanup.patch
vfs-mountinfo-stable-peer-group-id.patch
vfs-mountinfo-show-dominating-group-id.patch
vfs-optimization-to-proc-pid-mountinfo-patch.patch
vfs-mountinfo-only-show-mounts-under-tasks-root.patch
vfs-remove-lives_below_in_same_fs.patch
mm-bdi-export-bdi-attributes-in-sysfs.patch
mm-bdi-export-bdi-attributes-in-sysfs-fix.patch
mm-bdi-export-bdi-attributes-in-sysfs-fix-2.patch
mm-bdi-export-bdi-attributes-in-sysfs-fix-3.patch
mm-bdi-export-bdi-attributes-in-sysfs-fix-4.patch
mm-bdi-export-bdi-attributes-in-sysfs-ia64-fix.patch
mm-bdi-expose-the-bdi-object-in-sysfs-for-nfs.patch
mm-bdi-expose-the-bdi-object-in-sysfs-for-nfs-fix.patch
mm-bdi-expose-the-bdi-object-in-sysfs-for-fuse.patch
mm-bdi-expose-the-bdi-object-in-sysfs-for-fuse-fix.patch
mm-bdi-allow-setting-a-minimum-for-the-bdi-dirty-limit.patch
mm-bdi-allow-setting-a-maximum-for-the-bdi-dirty-limit.patch
mm-bdi-allow-setting-a-maximum-for-the-bdi-dirty-limit-fix.patch
mm-bdi-move-statistics-to-debugfs.patch
mm-bdi-add-separate-writeback-accounting-capability.patch
mm-bdi-export-bdi_writeout_inc.patch
mm-bdi-export-bdi_writeout_inc-fix.patch
mm-add-nr_writeback_temp-counter.patch
mm-document-missing-fields-for-proc-meminfo.patch
fuse-support-writable-mmap.patch
fuse-support-writable-mmap-fix.patch
fuse-clean-up-setting-i_size-in-write.patch
fuse-implement-perform_write.patch
fuse-update-file-size-on-short-read.patch
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