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Update hibernate-watermark.patch to what is in linux-next

This commit is contained in:
Josh Boyer 2012-04-24 12:12:19 -04:00
parent 3c9166a28c
commit 5d7c5404f1
1 changed files with 70 additions and 51 deletions
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121
hibernate-watermark.patch
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@ -1,9 +1,11 @@
Hi Rafael,
From: Bojan Smojver <bojan@rexursive.com>
Date: Sun, 22 Apr 2012 20:32:32 +0000 (+0200)
Subject: PM / Hibernate: fix the number of pages used for hibernate/thaw buffering
X-Git-Tag: next-20120423~31^2
X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Fnext%2Flinux-next.git;a=commitdiff_plain;h=e9cbc5a6270be7aa9c42d9b15293ba9ac7161262
One more version. Heeding Per's suggestion to optimise when
CONFIG_HIGHMEM is not configured.
PM / Hibernate: fix the number of pages used for hibernate/thaw buffering
---------------------------------------
Hibernation/thaw fixes/improvements:
1. Calculate the number of required free pages based on non-high memory
@ -25,13 +27,13 @@ threading patch.
6. Dispense with bit shifting arithmetic to improve readability.
Signed-off-by: Bojan Smojver <bojan@rexursive.com>
Signed-off-by: Per Olofsson <pelle@debian.org>
Reviewed-by: Per Olofsson <pelle@debian.org>
Cc: stable@vger.kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
kernel/power/swap.c | 76 +++++++++++++++++++++++++++++++++++++++------------
1 files changed, 58 insertions(+), 18 deletions(-)
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 8742fd0..8a1c293 100644
index 8742fd0..11e22c0 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -6,7 +6,7 @@
@ -43,30 +45,17 @@ index 8742fd0..8a1c293 100644
*
* This file is released under the GPLv2.
*
@@ -51,6 +51,36 @@
@@ -51,6 +51,23 @@
#define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1)
+/*
+ * Number of free pages that are not high.
+ */
+#ifdef CONFIG_HIGHMEM
+static unsigned long low_free_pages(void)
+{
+ struct zone *zone;
+ unsigned long free = 0;
+
+ for_each_populated_zone(zone)
+ if (!is_highmem(zone))
+ free += zone_page_state(zone, NR_FREE_PAGES);
+ return free;
+}
+#else
+static inline unsigned long low_free_pages(void)
+{
+ return nr_free_pages();
+ return nr_free_pages() - nr_free_highpages();
+}
+#endif
+
+/*
+ * Number of pages required to be kept free while writing the image. Always
@ -80,7 +69,7 @@ index 8742fd0..8a1c293 100644
struct swap_map_page {
sector_t entries[MAP_PAGE_ENTRIES];
sector_t next_swap;
@@ -72,7 +102,7 @@ struct swap_map_handle {
@@ -72,7 +89,7 @@ struct swap_map_handle {
sector_t cur_swap;
sector_t first_sector;
unsigned int k;
@ -89,7 +78,7 @@ index 8742fd0..8a1c293 100644
u32 crc32;
};
@@ -265,14 +295,17 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
@@ -265,14 +282,17 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
return -ENOSPC;
if (bio_chain) {
@ -109,7 +98,7 @@ index 8742fd0..8a1c293 100644
if (src) {
copy_page(src, buf);
} else {
@@ -316,8 +349,7 @@ static int get_swap_writer(struct swap_map_handle *handle)
@@ -316,8 +336,7 @@ static int get_swap_writer(struct swap_map_handle *handle)
goto err_rel;
}
handle->k = 0;
@ -119,7 +108,7 @@ index 8742fd0..8a1c293 100644
handle->first_sector = handle->cur_swap;
return 0;
err_rel:
@@ -351,12 +383,17 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
@@ -351,12 +370,17 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
clear_page(handle->cur);
handle->cur_swap = offset;
handle->k = 0;
@ -143,38 +132,78 @@ index 8742fd0..8a1c293 100644
}
out:
return error;
@@ -404,7 +441,7 @@ static int swap_writer_finish(struct swap_map_handle *handle,
@@ -403,8 +427,9 @@ static int swap_writer_finish(struct swap_map_handle *handle,
/* Maximum number of threads for compression/decompression. */
#define LZO_THREADS 3
/* Maximum number of pages for read buffering. */
-/* Maximum number of pages for read buffering. */
-#define LZO_READ_PAGES (MAP_PAGE_ENTRIES * 8)
+#define LZO_READ_PAGES 8192
+/* Minimum/maximum number of pages for read buffering. */
+#define LZO_MIN_RD_PAGES 1024
+#define LZO_MAX_RD_PAGES 8192
/**
@@ -615,10 +652,10 @@ static int save_image_lzo(struct swap_map_handle *handle,
@@ -615,12 +640,6 @@ 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;
-
- /*
* Start the CRC32 thread.
*/
init_waitqueue_head(&crc->go);
@@ -641,6 +660,12 @@ static int save_image_lzo(struct swap_map_handle *handle,
goto out_clean;
}
+ /*
+ * Adjust the number of required 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();
+
printk(KERN_INFO
"PM: Using %u thread(s) for compression.\n"
"PM: Compressing and saving image data (%u pages) ... ",
@@ -1051,7 +1076,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
unsigned i, thr, run_threads, nr_threads;
unsigned ring = 0, pg = 0, ring_size = 0,
have = 0, want, need, asked = 0;
- unsigned long read_pages;
+ unsigned long read_pages = 0;
unsigned char **page = NULL;
struct dec_data *data = NULL;
struct crc_data *crc = NULL;
@@ -1063,7 +1088,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
nr_threads = num_online_cpus() - 1;
nr_threads = clamp_val(nr_threads, 1, LZO_THREADS);
- page = vmalloc(sizeof(*page) * LZO_READ_PAGES);
+ page = vmalloc(sizeof(*page) * LZO_MAX_RD_PAGES);
if (!page) {
printk(KERN_ERR "PM: Failed to allocate LZO page\n");
ret = -ENOMEM;
@@ -1128,15 +1153,22 @@ static int load_image_lzo(struct swap_map_handle *handle,
}
/*
* Start the CRC32 thread.
@@ -1129,14 +1166,17 @@ static int load_image_lzo(struct swap_map_handle *handle,
/*
* Adjust number of pages for read buffering, in case we are short.
+ * Never take more than half of all available low pages.
- * Adjust number of pages for read buffering, in case we are short.
+ * Set the number of pages for read buffering.
+ * This is complete guesswork, because we'll only know the real
+ * picture once prepare_image() is called, which is much later on
+ * during the image load phase. We'll assume the worst case and
+ * say that none of the image pages are from high memory.
*/
- read_pages = (nr_free_pages() - snapshot_get_image_size()) >> 1;
+ read_pages = (low_free_pages() - snapshot_get_image_size()) / 2;
read_pages = clamp_val(read_pages, LZO_CMP_PAGES, LZO_READ_PAGES);
- read_pages = clamp_val(read_pages, LZO_CMP_PAGES, LZO_READ_PAGES);
+ if (low_free_pages() > snapshot_get_image_size())
+ read_pages = (low_free_pages() - snapshot_get_image_size()) / 2;
+ read_pages = clamp_val(read_pages, LZO_MIN_RD_PAGES, LZO_MAX_RD_PAGES);
for (i = 0; i < read_pages; i++) {
page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ?
@ -186,13 +215,3 @@ index 8742fd0..8a1c293 100644
if (!page[i]) {
if (i < LZO_CMP_PAGES) {
ring_size = i;
---------------------------------------
--
Bojan
--
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