diff options
| author | Nick Piggin <npiggin@suse.de> | 2008-02-06 04:39:10 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 13:41:15 -0500 |
| commit | 529e55b6a57bda6df9e45eb268589efc70f63303 (patch) | |
| tree | 6f9424043fa47f4c0a6f59e79fa7094ec10da6d1 /Documentation/fb/deferred_io.txt | |
| parent | 8c85fd89be565e7b7ff48d66b3544b320c129475 (diff) | |
fb: defio nopage
Convert fb defio from nopage to fault.
Switch from OOM to SIGBUS if the resource is not available.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Jaya Kumar <jayakumar.lkml@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/fb/deferred_io.txt')
| -rw-r--r-- | Documentation/fb/deferred_io.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/fb/deferred_io.txt b/Documentation/fb/deferred_io.txt index 63883a89212..74832837025 100644 --- a/Documentation/fb/deferred_io.txt +++ b/Documentation/fb/deferred_io.txt | |||
| @@ -7,10 +7,10 @@ IO. The following example may be a useful explanation of how one such setup | |||
| 7 | works: | 7 | works: |
| 8 | 8 | ||
| 9 | - userspace app like Xfbdev mmaps framebuffer | 9 | - userspace app like Xfbdev mmaps framebuffer |
| 10 | - deferred IO and driver sets up nopage and page_mkwrite handlers | 10 | - deferred IO and driver sets up fault and page_mkwrite handlers |
| 11 | - userspace app tries to write to mmaped vaddress | 11 | - userspace app tries to write to mmaped vaddress |
| 12 | - we get pagefault and reach nopage handler | 12 | - we get pagefault and reach fault handler |
| 13 | - nopage handler finds and returns physical page | 13 | - fault handler finds and returns physical page |
| 14 | - we get page_mkwrite where we add this page to a list | 14 | - we get page_mkwrite where we add this page to a list |
| 15 | - schedule a workqueue task to be run after a delay | 15 | - schedule a workqueue task to be run after a delay |
| 16 | - app continues writing to that page with no additional cost. this is | 16 | - app continues writing to that page with no additional cost. this is |