[kernel/f15] Disable threading on compression/decompression for hibernate

[Justin M. Forbes]

commit 93f9c95edbf93ef45a153694f3f68e82a29543d7
Author: Justin M. Forbes <jforbes at redhat.com>
Date:   Fri Mar 2 14:39:44 2012 -0600

    Disable threading on compression/decompression for hibernate

 ...le-threading-in-compression-for-hibernate.patch |   17 +++++++++++++++++
 kernel.spec                                        |    9 +++++++++
 2 files changed, 26 insertions(+), 0 deletions(-)
---
diff --git a/disable-threading-in-compression-for-hibernate.patch b/disable-threading-in-compression-for-hibernate.patch
new file mode 100644
index 0000000..685c294
--- /dev/null
+++ b/disable-threading-in-compression-for-hibernate.patch
@@ -0,0 +1,17 @@
+In attempt to find the cause of some of the hibernate issues we are seeing,
+turn off threading for compression.
+
+Signed-off-by: Justin M. Forbes <jforbes at redhat.com>
+
+diff -ruNp a/kernel/power/swap.c b/kernel/power/swap.c
+--- a/kernel/power/swap.c	2012-03-02 13:52:27.777485028 -0600
++++ b/kernel/power/swap.c	2012-03-02 14:05:20.168115129 -0600
+@@ -401,7 +401,7 @@ static int swap_writer_finish(struct swa
+ #define LZO_CMP_SIZE	(LZO_CMP_PAGES * PAGE_SIZE)
+ 
+ /* Maximum number of threads for compression/decompression. */
+-#define LZO_THREADS	3
++#define LZO_THREADS	1
+ 
+ /* Maximum number of pages for read buffering. */
+ #define LZO_READ_PAGES	(MAP_PAGE_ENTRIES * 8)
diff --git a/kernel.spec b/kernel.spec
index cc5497e..d818426 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -721,6 +721,9 @@ Patch21103: cifs-fix-dentry-refcount-leak-when-opening-a-FIFO.patch
 #rhbz 728478
 Patch21104: sony-laptop-Enable-keyboard-backlight-by-default.patch
 
+# Disable threading in hibernate compression
+Patch21105: disable-threading-in-compression-for-hibernate.patch
+
 Patch21200: unhandled-irqs-switch-to-polling.patch
 
 %endif
@@ -1335,6 +1338,9 @@ ApplyPatch cifs-fix-dentry-refcount-leak-when-opening-a-FIFO.patch
 #rhbz 728478
 ApplyPatch sony-laptop-Enable-keyboard-backlight-by-default.patch
 
+#Disable threading in hibernate compression
+ApplyPatch disable-threading-in-compression-for-hibernate.patch
+
 ApplyPatch unhandled-irqs-switch-to-polling.patch
 
 # END OF PATCH APPLICATIONS
@@ -1984,6 +1990,9 @@ fi
 # and build.
 
 %changelog
+* Fri Mar 02 2012 Justin M. Forbes <jforbes at redhat.com> 
+- Disable threading in hibernate compression/decompression
+
 * Fri Mar 02 2012 Adam Jackson <ajax at redhat.com>
 - drm-intel-crtc-dpms-fix.patch: Fix system hang on gen2 kit on DPMS (#730853)