PM / Hibernate: Improve performance of LZO/plain hibernation, checksum image

Use threads for LZO compression/decompression on hibernate/thaw.
Improve buffering on hibernate/thaw.
Calculate/verify CRC32 of the image pages on hibernate/thaw.

In my testing, this improved write/read speed by a factor of about two.

Signed-off-by: Bojan Smojver <bojan@rexursive.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index ea12c8f1bdf..1c53f7fad5f 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -657,6 +657,9 @@ int hibernate(void)
                         flags |= SF_PLATFORM_MODE;
                 if (nocompress)
                         flags |= SF_NOCOMPRESS_MODE;
+                else
+                        flags |= SF_CRC32_MODE;
+
                 pr_debug("PM: writing image.\n");
                 error = swsusp_write(flags);
                 swsusp_free();