Re: [PATCH]: Compress hibernation image with LZO (in-kernel)
From: Bojan Smojver
Date: Mon Aug 02 2010 - 22:30:49 EST
On Tue, 2010-08-03 at 11:59 +1000, Bojan Smojver wrote:
> PS. I also enhanced the patch to use overlapping compression in order
> to save memory. Looks like that's causing it to be slower on
> compression (we go down from 130 - 150 MB/s to around 105 - 110 MB/s),
> but still over 3 times faster than regular swsusp code. Decompression
> remains roughly the same around 100+ MB/s (this is double the speed of
> current swsusp code). I will post this a bit later on.
As promised.
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index ca6066a..cb57eb9 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -137,6 +137,8 @@ config SUSPEND_FREEZER
config HIBERNATION
bool "Hibernation (aka 'suspend to disk')"
depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
+ select LZO_COMPRESS
+ select LZO_DECOMPRESS
select SUSPEND_NVS if HAS_IOMEM
---help---
Enable the suspend to disk (STD) functionality, which is usually
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 006270f..a760cf8 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -103,10 +103,6 @@ struct snapshot_handle {
void *buffer; /* address of the block to read from
* or write to
*/
- int sync_read; /* Set to one to notify the caller of
- * snapshot_write_next() that it may
- * need to call wait_on_bio_chain()
- */
};
/* This macro returns the address from/to which the caller of
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 25ce010..f24ee24 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -2135,8 +2135,6 @@ int snapshot_write_next(struct snapshot_handle *handle)
if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages)
return 0;
- handle->sync_read = 1;
-
if (!handle->cur) {
if (!buffer)
/* This makes the buffer be freed by swsusp_free() */
@@ -2169,7 +2167,6 @@ int snapshot_write_next(struct snapshot_handle *handle)
memory_bm_position_reset(&orig_bm);
restore_pblist = NULL;
handle->buffer = get_buffer(&orig_bm, &ca);
- handle->sync_read = 0;
if (IS_ERR(handle->buffer))
return PTR_ERR(handle->buffer);
}
@@ -2178,8 +2175,6 @@ int snapshot_write_next(struct snapshot_handle *handle)
handle->buffer = get_buffer(&orig_bm, &ca);
if (IS_ERR(handle->buffer))
return PTR_ERR(handle->buffer);
- if (handle->buffer != buffer)
- handle->sync_read = 0;
}
handle->cur++;
return PAGE_SIZE;
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index b0bb217..5a83fd3 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -24,6 +24,7 @@
#include <linux/swapops.h>
#include <linux/pm.h>
#include <linux/slab.h>
+#include <linux/lzo.h>
#include "power.h"
@@ -357,6 +358,18 @@ static int swap_writer_finish(struct swap_map_handle *handle,
return error;
}
+#define LZO_HEADER sizeof(size_t)
+#define LZO_UNC_PAGES 64
+#define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE)
+#define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \
+ LZO_HEADER, PAGE_SIZE)
+#define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE)
+#define LZO_OVH_PAGES DIV_ROUND_UP((LZO_UNC_SIZE > 0xBFFF ? \
+ 0xBFFF : LZO_UNC_SIZE) + \
+ LZO_UNC_SIZE / 16 + 64 + 3 + \
+ LZO_HEADER, PAGE_SIZE)
+#define LZO_OVH_SIZE (LZO_OVH_PAGES + PAGE_SIZE)
+
/**
* save_image - save the suspend image data
*/
@@ -372,6 +385,29 @@ static int save_image(struct swap_map_handle *handle,
struct bio *bio;
struct timeval start;
struct timeval stop;
+ size_t ul, cl;
+ unsigned char *buf, *wrk, *page;
+
+ page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
+ if (!page) {
+ printk(KERN_ERR "PM: Failed to allocate LZO page\n");
+ return -ENOMEM;
+ }
+
+ wrk = vmalloc(LZO1X_1_MEM_COMPRESS);
+ if (!wrk) {
+ printk(KERN_ERR "PM: Failed to allocate LZO workspace\n");
+ free_page((unsigned long)page);
+ return -ENOMEM;
+ }
+
+ buf = vmalloc(LZO_UNC_SIZE + LZO_OVH_SIZE);
+ if (!buf) {
+ printk(KERN_ERR "PM: Failed to allocate LZO buffer\n");
+ vfree(wrk);
+ free_page((unsigned long)page);
+ return -ENOMEM;
+ }
printk(KERN_INFO "PM: Saving image data pages (%u pages) ... ",
nr_to_write);
@@ -382,16 +418,50 @@ static int save_image(struct swap_map_handle *handle,
bio = NULL;
do_gettimeofday(&start);
while (1) {
- ret = snapshot_read_next(snapshot);
- if (ret <= 0)
+ for (ul = 0; ul < LZO_UNC_SIZE; ul += PAGE_SIZE) {
+ ret = snapshot_read_next(snapshot);
+ if (ret < 0)
+ goto out_finish;
+
+ if (ret == 0)
+ break;
+
+ memcpy(buf + LZO_OVH_SIZE + ul,
+ data_of(*snapshot), PAGE_SIZE);
+
+ if (!(nr_pages % m))
+ printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m);
+ nr_pages++;
+ }
+
+ if (ul == 0)
+ break;
+
+ ret = lzo1x_1_compress(buf + LZO_OVH_SIZE, ul,
+ buf + LZO_HEADER, &cl, wrk);
+ if (ret < 0) {
+ printk(KERN_ERR "PM: LZO compression failed\n");
break;
- ret = swap_write_page(handle, data_of(*snapshot), &bio);
- if (ret)
+ }
+
+ if (unlikely(cl == 0 || LZO_HEADER + cl > LZO_CMP_SIZE)) {
+ printk(KERN_ERR "PM: Invalid LZO length\n");
+ ret = -1;
break;
- if (!(nr_pages % m))
- printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m);
- nr_pages++;
+ }
+
+ *(size_t *)buf = cl;
+
+ for (ul = 0; ul < LZO_HEADER + cl; ul += PAGE_SIZE) {
+ memcpy(page, buf + ul, PAGE_SIZE);
+
+ ret = swap_write_page(handle, page, &bio);
+ if (ret)
+ goto out_finish;
+ }
}
+
+out_finish:
err2 = hib_wait_on_bio_chain(&bio);
do_gettimeofday(&stop);
if (!ret)
@@ -401,6 +471,11 @@ static int save_image(struct swap_map_handle *handle,
else
printk(KERN_CONT "\n");
swsusp_show_speed(&start, &stop, nr_to_write, "Wrote");
+
+ vfree(buf);
+ vfree(wrk);
+ free_page((unsigned long)page);
+
return ret;
}
@@ -416,7 +491,8 @@ static int enough_swap(unsigned int nr_pages)
unsigned int free_swap = count_swap_pages(root_swap, 1);
pr_debug("PM: Free swap pages: %u\n", free_swap);
- return free_swap > nr_pages + PAGES_FOR_IO;
+ return free_swap >
+ (nr_pages * LZO_CMP_PAGES) / LZO_UNC_PAGES + 1 + PAGES_FOR_IO;
}
/**
@@ -547,9 +623,22 @@ static int load_image(struct swap_map_handle *handle,
int error = 0;
struct timeval start;
struct timeval stop;
- struct bio *bio;
- int err2;
unsigned nr_pages;
+ size_t ul, cl, off;
+ unsigned char *buf, *page;
+
+ page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
+ if (!page) {
+ printk(KERN_ERR "PM: Failed to allocate LZO page\n");
+ return -ENOMEM;
+ }
+
+ buf = vmalloc(LZO_CMP_SIZE);
+ if (!buf) {
+ printk(KERN_ERR "PM: Failed to allocate LZO buffer\n");
+ free_page((unsigned long)page);
+ return -ENOMEM;
+ }
printk(KERN_INFO "PM: Loading image data pages (%u pages) ... ",
nr_to_read);
@@ -557,27 +646,63 @@ static int load_image(struct swap_map_handle *handle,
if (!m)
m = 1;
nr_pages = 0;
- bio = NULL;
do_gettimeofday(&start);
+
+ error = snapshot_write_next(snapshot);
+ if (error <= 0)
+ goto out_finish;
+
for ( ; ; ) {
- error = snapshot_write_next(snapshot);
- if (error <= 0)
- break;
- error = swap_read_page(handle, data_of(*snapshot), &bio);
+ error = swap_read_page(handle, page, NULL); /* sync */
if (error)
break;
- if (snapshot->sync_read)
- error = hib_wait_on_bio_chain(&bio);
- if (error)
+
+ cl = *(size_t *)page;
+ if (unlikely(cl == 0 || LZO_HEADER + cl > LZO_CMP_SIZE)) {
+ printk(KERN_ERR "PM: Invalid LZO length\n");
+ error = -1;
break;
- if (!(nr_pages % m))
- printk("\b\b\b\b%3d%%", nr_pages / m);
- nr_pages++;
+ }
+
+ off = LZO_CMP_SIZE - roundup(cl + LZO_HEADER, PAGE_SIZE);
+ memcpy(buf + off, page, PAGE_SIZE);
+
+ for (ul = PAGE_SIZE; ul < LZO_HEADER + cl; ul += PAGE_SIZE) {
+ error = swap_read_page(handle, page, NULL); /* sync */
+ if (error)
+ goto out_finish;
+ memcpy(buf + off + ul, page, PAGE_SIZE);
+ }
+
+ ul = LZO_UNC_SIZE;
+ error = lzo1x_decompress_safe(buf + off + LZO_HEADER, cl,
+ buf, &ul);
+ if (error < 0) {
+ printk(KERN_ERR "PM: LZO decompression failed\n");
+ break;
+ }
+
+ if (unlikely(ul == 0 || ul > LZO_UNC_SIZE)) {
+ printk(KERN_ERR "PM: Invalid LZO length\n");
+ error = -1;
+ break;
+ }
+
+ for (cl = 0; cl < ul; cl += PAGE_SIZE) {
+ memcpy(data_of(*snapshot), buf + cl, PAGE_SIZE);
+
+ if (!(nr_pages % m))
+ printk("\b\b\b\b%3d%%", nr_pages / m);
+ nr_pages++;
+
+ error = snapshot_write_next(snapshot);
+ if (error <= 0)
+ goto out_finish;
+ }
}
- err2 = hib_wait_on_bio_chain(&bio);
+
+out_finish:
do_gettimeofday(&stop);
- if (!error)
- error = err2;
if (!error) {
printk("\b\b\b\bdone\n");
snapshot_write_finalize(snapshot);
@@ -586,6 +711,10 @@ static int load_image(struct swap_map_handle *handle,
} else
printk("\n");
swsusp_show_speed(&start, &stop, nr_to_read, "Read");
+
+ vfree(buf);
+ free_page((unsigned long)page);
+
return error;
}
--
Bojan
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