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authorIngo Molnar <mingo@elte.hu>2010-12-22 11:53:20 +0100
committerIngo Molnar <mingo@elte.hu>2010-12-22 11:53:23 +0100
commit6c529a266bdc590a870ee2d2092ff6527eff427b (patch)
tree7be65fa2578820a1258b5a1e8e063a509a5d6176 /Documentation
parent7639dae0ca11038286bbbcda05f2bef601c1eb8d (diff)
parent90a8a73c06cc32b609a880d48449d7083327e11a (diff)
Merge commit 'v2.6.37-rc7' into perf/core
Merge reason: Pick up the latest -rc. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/Locking7
-rw-r--r--Documentation/filesystems/vfs.txt7
-rw-r--r--Documentation/kernel-parameters.txt5
-rw-r--r--Documentation/power/runtime_pm.txt4
4 files changed, 15 insertions, 8 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index a91f3089001..b6426f15b4a 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -173,12 +173,13 @@ prototypes:
sector_t (*bmap)(struct address_space *, sector_t);
int (*invalidatepage) (struct page *, unsigned long);
int (*releasepage) (struct page *, int);
+ void (*freepage)(struct page *);
int (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
loff_t offset, unsigned long nr_segs);
int (*launder_page) (struct page *);
locking rules:
- All except set_page_dirty may block
+ All except set_page_dirty and freepage may block
BKL PageLocked(page) i_mutex
writepage: no yes, unlocks (see below)
@@ -193,6 +194,7 @@ perform_write: no n/a yes
bmap: no
invalidatepage: no yes
releasepage: no yes
+freepage: no yes
direct_IO: no
launder_page: no yes
@@ -288,6 +290,9 @@ buffers from the page in preparation for freeing it. It returns zero to
indicate that the buffers are (or may be) freeable. If ->releasepage is zero,
the kernel assumes that the fs has no private interest in the buffers.
+ ->freepage() is called when the kernel is done dropping the page
+from the page cache.
+
->launder_page() may be called prior to releasing a page if
it is still found to be dirty. It returns zero if the page was successfully
cleaned, or an error value if not. Note that in order to prevent the page
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 55c28b79d8d..20899e095e7 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -534,6 +534,7 @@ struct address_space_operations {
sector_t (*bmap)(struct address_space *, sector_t);
int (*invalidatepage) (struct page *, unsigned long);
int (*releasepage) (struct page *, int);
+ void (*freepage)(struct page *);
ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
loff_t offset, unsigned long nr_segs);
struct page* (*get_xip_page)(struct address_space *, sector_t,
@@ -678,6 +679,12 @@ struct address_space_operations {
need to ensure this. Possibly it can clear the PageUptodate
bit if it cannot free private data yet.
+ freepage: freepage is called once the page is no longer visible in
+ the page cache in order to allow the cleanup of any private
+ data. Since it may be called by the memory reclaimer, it
+ should not assume that the original address_space mapping still
+ exists, and it should not block.
+
direct_IO: called by the generic read/write routines to perform
direct_IO - that is IO requests which bypass the page cache
and transfer data directly between the storage and the
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 5e55e4623ab..316c723a950 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2167,11 +2167,6 @@ and is between 256 and 4096 characters. It is defined in the file
reset_devices [KNL] Force drivers to reset the underlying device
during initialization.
- resource_alloc_from_bottom
- Allocate new resources from the beginning of available
- space, not the end. If you need to use this, please
- report a bug.
-
resume= [SWSUSP]
Specify the partition device for software suspend
diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt
index 489e9bacd16..41cc7b30d7d 100644
--- a/Documentation/power/runtime_pm.txt
+++ b/Documentation/power/runtime_pm.txt
@@ -379,8 +379,8 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
zero)
bool pm_runtime_suspended(struct device *dev);
- - return true if the device's runtime PM status is 'suspended', or false
- otherwise
+ - return true if the device's runtime PM status is 'suspended' and its
+ 'power.disable_depth' field is equal to zero, or false otherwise
void pm_runtime_allow(struct device *dev);
- set the power.runtime_auto flag for the device and decrease its usage