linux.git/mm/page-writeback.c, branch v2.6.17

[PATCH] page-writeback comment fixes

2006-04-11T13:18:46+00:00

Signed-off-by: Coywolf Qi Hunt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Documentation: fix minor kernel-doc warnings

2006-04-02T11:59:55+00:00

This patch updates the comments to match the actual code.

Signed-off-by: Martin Waitz 
Signed-off-by: Adrian Bunk

[PATCH] set_page_dirty() return value fixes

2006-03-24T15:33:26+00:00

We need set_page_dirty() to return true if it actually transitioned the page
from a clean to dirty state.  This wasn't right in a couple of places.  Do a
kernel-wide audit, fix things up.

This leaves open the possibility of returning a negative errno from
set_page_dirty() sometime in the future.  But we don't do that at present.

Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] balance_dirty_pages_ratelimited: take nr_pages arg

2006-03-24T15:33:26+00:00

Modify balance_dirty_pages_ratelimited() so that it can take a
number-of-pages-which-I-just-dirtied argument.  For msync().

Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Represent laptop_mode as jiffies internally

2006-03-24T15:33:20+00:00

Make that the internal value for /proc/sys/vm/laptop_mode is stored as
jiffies instead of seconds.  Let the sysctl interface do the conversions,
instead of doing on-the-fly conversions every time the value is used.

Add a description of the fact that laptop_mode doubles as a flag and a
timeout to the comment above the laptop_mode variable.

Signed-off-by: Bart Samwel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Represent dirty_*_centisecs as jiffies internally

2006-03-24T15:33:20+00:00

Make that the internal values for:

/proc/sys/vm/dirty_writeback_centisecs
/proc/sys/vm/dirty_expire_centisecs

are stored as jiffies instead of centiseconds.  Let the sysctl interface do
the conversions with full precision using clock_t_to_jiffies, instead of
doing overflow-sensitive on-the-fly conversions every time the values are
used.

Cons: apparent precision loss if HZ is not a multiple of 100, because of
conversion back and forth.  This is a common problem for all sysctl values
that use proc_dointvec_userhz_jiffies.  (There is only one other in-tree
use, in net/core/neighbour.c.)

Signed-off-by: Bart Samwel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mm: dirty_exceeded speedup

2006-01-19T03:20:17+00:00

Ravikiran reports that this variable is bouncing all around nodes on NUMA
machines, causing measurable performance problems.  Fix that up by only
writing to it when it actually changed.

And put it in a new cacheline to prevent it sharing with other things (this
happened).

Signed-off-by: Ravikiran Thirumalai 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

identify multipage ->writepages() calls

2006-01-06T19:58:38+00:00

 NFS needs to be able to distinguish between single-page ->writepage() calls and
 multipage ->writepages() calls.

 For the single-page writepage calls NFS can kick off the I/O within the
 context of ->writepage().

 For multipage ->writepages calls, nfs_writepage() will leave the I/O pending
 and nfs_writepages() will kick off the I/O when it all has been queued up
 within NFS.

 Cc: Trond Myklebust 
 Signed-off-by: Andrew Morton 
 Signed-off-by: Trond Myklebust

[PATCH] re-export clear_page_dirty_for_io()

2005-11-18T15:49:45+00:00

2.6.14 has this exported, and reiser4 (at least) uses it.  Put things back
the way they were.

Signed-off-by: Vladimir V. Saveliev 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] unexport clear_page_dirty_for_io

2005-11-07T15:54:06+00:00

I didn't find any possible modular usage in the kernel.

Signed-off-by: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds