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authorLinus Torvalds <torvalds@linux-foundation.org>2012-04-29 15:00:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-29 15:00:44 -0700
commit6cfdd02b886aac866098f33262d409565f101ce0 (patch)
tree178b5abf48eb98b9ef0a29d865d7214798ed8b57 /kernel
parent64f371bc3107e69efce563a3d0f0e6880de0d537 (diff)
parent26e0f90fded422f309deb6169dfbccb204435698 (diff)
downloadlinux-6cfdd02b886aac866098f33262d409565f101ce0.tar.gz
Merge tag 'pm-for-3.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management fixes from Rafael J. Wysocki: "Fix for an issue causing hibernation to hang on systems with highmem (that practically means i386) due to broken memory management (bug introduced in 3.2, so -stable material) and PM documentation update making the freezer documentation follow the code again after some recent updates." * tag 'pm-for-3.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: PM / Freezer / Docs: Update documentation about freezing of tasks PM / Hibernate: fix the number of pages used for hibernate/thaw buffering
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/swap.c28
1 files changed, 22 insertions, 6 deletions
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 8742fd013a9..eef311a58a6 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -51,6 +51,23 @@
#define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1)
+/*
+ * Number of free pages that are not high.
+ */
+static inline unsigned long low_free_pages(void)
+{
+ return nr_free_pages() - nr_free_highpages();
+}
+
+/*
+ * Number of pages required to be kept free while writing the image. Always
+ * half of all available low pages before the writing starts.
+ */
+static inline unsigned long reqd_free_pages(void)
+{
+ return low_free_pages() / 2;
+}
+
struct swap_map_page {
sector_t entries[MAP_PAGE_ENTRIES];
sector_t next_swap;
@@ -72,7 +89,7 @@ struct swap_map_handle {
sector_t cur_swap;
sector_t first_sector;
unsigned int k;
- unsigned long nr_free_pages, written;
+ unsigned long reqd_free_pages;
u32 crc32;
};
@@ -316,8 +333,7 @@ static int get_swap_writer(struct swap_map_handle *handle)
goto err_rel;
}
handle->k = 0;
- handle->nr_free_pages = nr_free_pages() >> 1;
- handle->written = 0;
+ handle->reqd_free_pages = reqd_free_pages();
handle->first_sector = handle->cur_swap;
return 0;
err_rel:
@@ -352,11 +368,11 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
handle->cur_swap = offset;
handle->k = 0;
}
- if (bio_chain && ++handle->written > handle->nr_free_pages) {
+ if (bio_chain && low_free_pages() <= handle->reqd_free_pages) {
error = hib_wait_on_bio_chain(bio_chain);
if (error)
goto out;
- handle->written = 0;
+ handle->reqd_free_pages = reqd_free_pages();
}
out:
return error;
@@ -618,7 +634,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
* Adjust number of free pages after all allocations have been done.
* We don't want to run out of pages when writing.
*/
- handle->nr_free_pages = nr_free_pages() >> 1;
+ handle->reqd_free_pages = reqd_free_pages();
/*
* Start the CRC32 thread.