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Code Issues 2 Packages Projects Releases Wiki Activity

fb: defio nopage

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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>
This commit is contained in:
Nick Piggin
2008-02-06 01:39:10 -08:00
committed by Linus Torvalds
parent 8c85fd89be
commit 529e55b6a5
2 changed files with 11 additions and 12 deletions
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6
Documentation/fb/deferred_io.txt
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@@ -7,10 +7,10 @@ IO. The following example may be a useful explanation of how one such setup
works:
- userspace app like Xfbdev mmaps framebuffer
- deferred IO and driver sets up nopage and page_mkwrite handlers
- deferred IO and driver sets up fault and page_mkwrite handlers
- userspace app tries to write to mmaped vaddress
- we get pagefault and reach nopage handler
- nopage handler finds and returns physical page
- we get pagefault and reach fault handler
- fault handler finds and returns physical page
- we get page_mkwrite where we add this page to a list
- schedule a workqueue task to be run after a delay
- app continues writing to that page with no additional cost. this is