* [patch 1/4] mm: bdi: add separate writeback accounting capability
2008-03-18 18:56 [patch 0/4] fuse: writable mmap fixes Miklos Szeredi
@ 2008-03-18 18:56 ` Miklos Szeredi, Miklos Szeredi
2008-03-18 18:56 ` [patch 2/4] mm: bdi: export bdi_writeout_inc() fix Miklos Szeredi, Miklos Szeredi
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Miklos Szeredi, Miklos Szeredi @ 2008-03-18 18:56 UTC (permalink / raw)
To: akpm; +Cc: peterz, linux-kernel, linux-fsdevel, linux-mm
[-- Attachment #1: bdi_cap_account_writeback.patch --]
[-- Type: text/plain, Size: 11114 bytes --]
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@suse.cz>
---
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(-)
Index: linux/fs/configfs/inode.c
===================================================================
--- linux.orig/fs/configfs/inode.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/fs/configfs/inode.c 2008-03-18 19:38:45.000000000 +0100
@@ -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 ={
Index: linux/fs/hugetlbfs/inode.c
===================================================================
--- linux.orig/fs/hugetlbfs/inode.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/fs/hugetlbfs/inode.c 2008-03-18 19:38:45.000000000 +0100
@@ -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;
Index: linux/fs/ocfs2/dlm/dlmfs.c
===================================================================
--- linux.orig/fs/ocfs2/dlm/dlmfs.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/fs/ocfs2/dlm/dlmfs.c 2008-03-18 19:38:45.000000000 +0100
@@ -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)
Index: linux/fs/ramfs/inode.c
===================================================================
--- linux.orig/fs/ramfs/inode.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/fs/ramfs/inode.c 2008-03-18 19:38:45.000000000 +0100
@@ -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,
};
Index: linux/fs/sysfs/inode.c
===================================================================
--- linux.orig/fs/sysfs/inode.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/fs/sysfs/inode.c 2008-03-18 19:38:45.000000000 +0100
@@ -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 ={
Index: linux/include/linux/backing-dev.h
===================================================================
--- linux.orig/include/linux/backing-dev.h 2008-03-18 19:27:43.000000000 +0100
+++ linux/include/linux/backing-dev.h 2008-03-18 19:38:45.000000000 +0100
@@ -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;
@@ -153,22 +154,43 @@ 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 || \
@@ -208,17 +230,32 @@ 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 */
Index: linux/kernel/cgroup.c
===================================================================
--- linux.orig/kernel/cgroup.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/kernel/cgroup.c 2008-03-18 19:38:45.000000000 +0100
@@ -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)
Index: linux/mm/page-writeback.c
===================================================================
--- linux.orig/mm/page-writeback.c 2008-03-18 19:38:34.000000000 +0100
+++ linux/mm/page-writeback.c 2008-03-18 19:38:45.000000000 +0100
@@ -1257,7 +1257,7 @@ 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);
}
@@ -1286,7 +1286,7 @@ 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))
Index: linux/mm/shmem.c
===================================================================
--- linux.orig/mm/shmem.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/mm/shmem.c 2008-03-18 19:38:45.000000000 +0100
@@ -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,
};
Index: linux/mm/swap_state.c
===================================================================
--- linux.orig/mm/swap_state.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/mm/swap_state.c 2008-03-18 19:38:45.000000000 +0100
@@ -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,
};
--
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^ permalink raw reply [flat|nested] 5+ messages in thread* [patch 3/4] mm: document missing fields for /proc/meminfo
2008-03-18 18:56 [patch 0/4] fuse: writable mmap fixes Miklos Szeredi
2008-03-18 18:56 ` [patch 1/4] mm: bdi: add separate writeback accounting capability Miklos Szeredi, Miklos Szeredi
2008-03-18 18:56 ` [patch 2/4] mm: bdi: export bdi_writeout_inc() fix Miklos Szeredi, Miklos Szeredi
@ 2008-03-18 18:56 ` Miklos Szeredi, Miklos Szeredi
2008-03-18 18:56 ` [patch 4/4] fuse: support writable mmap fix Miklos Szeredi, Miklos Szeredi
3 siblings, 0 replies; 5+ messages in thread
From: Miklos Szeredi, Miklos Szeredi @ 2008-03-18 18:56 UTC (permalink / raw)
To: akpm; +Cc: peterz, linux-kernel, linux-fsdevel, linux-mm
[-- Attachment #1: proc_meminfo_doc.patch --]
[-- Type: text/plain, Size: 2913 bytes --]
A few fields in /proc/meminfo were not documented. Fix.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
Documentation/filesystems/proc.txt | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
Index: linux/Documentation/filesystems/proc.txt
===================================================================
--- linux.orig/Documentation/filesystems/proc.txt 2008-03-18 19:27:43.000000000 +0100
+++ linux/Documentation/filesystems/proc.txt 2008-03-18 19:41:40.000000000 +0100
@@ -463,11 +463,17 @@ SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 968 kB
Writeback: 0 kB
+AnonPages: 861800 kB
Mapped: 280372 kB
-Slab: 684068 kB
+Slab: 284364 kB
+SReclaimable: 159856 kB
+SUnreclaim: 124508 kB
+PageTables: 24448 kB
+NFS_Unstable: 0 kB
+Bounce: 0 kB
+WritebackTmp: 0 kB
CommitLimit: 7669796 kB
Committed_AS: 100056 kB
-PageTables: 24448 kB
VmallocTotal: 112216 kB
VmallocUsed: 428 kB
VmallocChunk: 111088 kB
@@ -503,8 +509,17 @@ VmallocChunk: 111088 kB
on the disk
Dirty: Memory which is waiting to get written back to the disk
Writeback: Memory which is actively being written back to the disk
+ AnonPages: Non-file backed pages mapped into userspace page tables
Mapped: files which have been mmaped, such as libraries
Slab: in-kernel data structures cache
+SReclaimable: Part of Slab, that might be reclaimed, such as caches
+ SUnreclaim: Part of Slab, that cannot be reclaimed on memory pressure
+ PageTables: amount of memory dedicated to the lowest level of page
+ tables.
+NFS_Unstable: NFS pages sent to the server, but not yet committed to stable
+ storage
+ Bounce: Memory used for block device "bounce buffers"
+WritebackTmp: Memory used by FUSE for temporary writeback buffers
CommitLimit: Based on the overcommit ratio ('vm.overcommit_ratio'),
this is the total amount of memory currently available to
be allocated on the system. This limit is only adhered to
@@ -531,8 +546,6 @@ Committed_AS: The amount of memory prese
above) will not be permitted. This is useful if one needs
to guarantee that processes will not fail due to lack of
memory once that memory has been successfully allocated.
- PageTables: amount of memory dedicated to the lowest level of page
- tables.
VmallocTotal: total size of vmalloc memory area
VmallocUsed: amount of vmalloc area which is used
VmallocChunk: largest contigious block of vmalloc area which is free
--
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^ permalink raw reply [flat|nested] 5+ messages in thread* [patch 4/4] fuse: support writable mmap fix
2008-03-18 18:56 [patch 0/4] fuse: writable mmap fixes Miklos Szeredi
` (2 preceding siblings ...)
2008-03-18 18:56 ` [patch 3/4] mm: document missing fields for /proc/meminfo Miklos Szeredi, Miklos Szeredi
@ 2008-03-18 18:56 ` Miklos Szeredi, Miklos Szeredi
3 siblings, 0 replies; 5+ messages in thread
From: Miklos Szeredi, Miklos Szeredi @ 2008-03-18 18:56 UTC (permalink / raw)
To: akpm; +Cc: peterz, linux-kernel, linux-fsdevel, linux-mm
[-- Attachment #1: fuse_mmap_write_fix.patch --]
[-- Type: text/plain, Size: 1683 bytes --]
Set the BDI_CAP_NO_ACCT_WB capability, so that fuse can do it's own
accounting of writeback pages.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
fs/fuse/file.c | 3 ++-
fs/fuse/inode.c | 2 ++
2 files changed, 4 insertions(+), 1 deletion(-)
Index: linux/fs/fuse/file.c
===================================================================
--- linux.orig/fs/fuse/file.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/fs/fuse/file.c 2008-03-18 19:43:40.000000000 +0100
@@ -1145,8 +1145,9 @@ static int fuse_writepage_locked(struct
req->end = fuse_writepage_end;
req->inode = inode;
+ inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK);
inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
- __end_page_writeback(page, false);
+ end_page_writeback(page);
spin_lock(&fc->lock);
list_add(&req->writepages_entry, &fi->writepages);
Index: linux/fs/fuse/inode.c
===================================================================
--- linux.orig/fs/fuse/inode.c 2008-03-18 19:27:43.000000000 +0100
+++ linux/fs/fuse/inode.c 2008-03-18 19:43:40.000000000 +0100
@@ -483,6 +483,8 @@ static struct fuse_conn *new_conn(struct
atomic_set(&fc->num_waiting, 0);
fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
fc->bdi.unplug_io_fn = default_unplug_io_fn;
+ /* fuse does it's own writeback accounting */
+ fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
fc->dev = sb->s_dev;
err = bdi_init(&fc->bdi);
if (err)
--
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^ permalink raw reply [flat|nested] 5+ messages in thread