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SubjectRe: [PATCH v8]: Improve performance of LZO/plain hibernation
From
Date
On Fri, 2011-10-07 at 14:20 +1100, Bojan Smojver wrote:
> I'll send you that when I test it.

Obviously, the following is not for mass consumption (it will slow the
v8 patch by a factor of 2), but rather for you to test, so that we can
verify that what you're getting back are valid pages after
decompression.

Let me know whether this fails for you on image checksum comparison.

PS. Yes, the checksum code should be running in a separate thread. :-)

----------------------------------------
kernel/power/Kconfig | 2 +
kernel/power/hibernate.c | 3 +
kernel/power/swap.c | 695 +++++++++++++++++++++++++++++++++++-----------
3 files changed, 535 insertions(+), 165 deletions(-)
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 3744c59..0fd83f7 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -27,6 +27,8 @@ config HIBERNATION
select HIBERNATE_CALLBACKS
select LZO_COMPRESS
select LZO_DECOMPRESS
+ select CRYPTO
+ select CRYPTO_SHA1
---help---
Enable the suspend to disk (STD) functionality, which is usually
called "hibernation" in user interfaces. STD checkpoints the
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 8f7b1db..443df6c 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -650,6 +650,9 @@ int hibernate(void)
flags |= SF_PLATFORM_MODE;
if (nocompress)
flags |= SF_NOCOMPRESS_MODE;
+ else
+ flags |= SF_SHA1DIGEST_MODE;
+
pr_debug("PM: writing image.\n");
error = swsusp_write(flags);
swsusp_free();
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 7c97c3a..bffbbe2 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -27,6 +27,12 @@
#include <linux/slab.h>
#include <linux/lzo.h>
#include <linux/vmalloc.h>
+#include <linux/cpumask.h>
+#include <linux/atomic.h>
+#include <linux/kthread.h>
+#include <linux/crypto.h>
+#include <linux/scatterlist.h>
+#include <crypto/sha.h>

#include "power.h"

@@ -43,8 +49,7 @@
* allocated and populated one at a time, so we only need one memory
* page to set up the entire structure.
*
- * During resume we also only need to use one swap_map_page structure
- * at a time.
+ * During resume we pick up all swap_map_page structures into a list.
*/

#define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1)
@@ -54,6 +59,11 @@ struct swap_map_page {
sector_t next_swap;
};

+struct swap_map_page_list {
+ struct swap_map_page *map;
+ struct swap_map_page_list *next;
+};
+
/**
* The swap_map_handle structure is used for handling swap in
* a file-alike way
@@ -61,13 +71,21 @@ struct swap_map_page {

struct swap_map_handle {
struct swap_map_page *cur;
+ struct swap_map_page_list *maps;
sector_t cur_swap;
sector_t first_sector;
unsigned int k;
+ unsigned long nr_free_pages, written;
+ struct crypto_hash *tfm;
+ struct hash_desc desc;
+ struct scatterlist sg;
+ u8 digest[SHA1_DIGEST_SIZE];
};

struct swsusp_header {
- char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int)];
+ char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) -
+ sizeof(u8) * SHA1_DIGEST_SIZE];
+ u8 digest[SHA1_DIGEST_SIZE];
sector_t image;
unsigned int flags; /* Flags to pass to the "boot" kernel */
char orig_sig[10];
@@ -199,6 +217,9 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
memcpy(swsusp_header->sig, HIBERNATE_SIG, 10);
swsusp_header->image = handle->first_sector;
swsusp_header->flags = flags;
+ if (flags & SF_SHA1DIGEST_MODE)
+ memcpy(swsusp_header->digest,
+ handle->digest, SHA1_DIGEST_SIZE);
error = hib_bio_write_page(swsusp_resume_block,
swsusp_header, NULL);
} else {
@@ -245,6 +266,7 @@ static int swsusp_swap_check(void)
static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
{
void *src;
+ int ret;

if (!offset)
return -ENOSPC;
@@ -254,9 +276,17 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
if (src) {
copy_page(src, buf);
} else {
- WARN_ON_ONCE(1);
- bio_chain = NULL; /* Go synchronous */
- src = buf;
+ ret = hib_wait_on_bio_chain(bio_chain); /* Free pages */
+ if (ret)
+ return ret;
+ src = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
+ if (src) {
+ copy_page(src, buf);
+ } else {
+ WARN_ON_ONCE(1);
+ bio_chain = NULL; /* Go synchronous */
+ src = buf;
+ }
}
} else {
src = buf;
@@ -269,6 +299,10 @@ static void release_swap_writer(struct swap_map_handle *handle)
if (handle->cur)
free_page((unsigned long)handle->cur);
handle->cur = NULL;
+ if (handle->tfm) {
+ crypto_free_hash(handle->tfm);
+ handle->tfm = NULL;
+ }
}

static int get_swap_writer(struct swap_map_handle *handle)
@@ -293,7 +327,19 @@ static int get_swap_writer(struct swap_map_handle *handle)
goto err_rel;
}
handle->k = 0;
+ handle->nr_free_pages = nr_free_pages();
+ handle->written = 0;
handle->first_sector = handle->cur_swap;
+ handle->tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(handle->tfm)) {
+ handle->tfm = NULL;
+ ret = -ENOMEM;
+ goto err_rel;
+ }
+ handle->desc.tfm = handle->tfm;
+ handle->desc.flags = 0;
+ crypto_hash_init(&handle->desc);
+ sg_init_table(&handle->sg, 1);
return 0;
err_rel:
release_swap_writer(handle);
@@ -316,20 +362,23 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
return error;
handle->cur->entries[handle->k++] = offset;
if (handle->k >= MAP_PAGE_ENTRIES) {
- error = hib_wait_on_bio_chain(bio_chain);
- if (error)
- goto out;
offset = alloc_swapdev_block(root_swap);
if (!offset)
return -ENOSPC;
handle->cur->next_swap = offset;
- error = write_page(handle->cur, handle->cur_swap, NULL);
+ error = write_page(handle->cur, handle->cur_swap, bio_chain);
if (error)
goto out;
clear_page(handle->cur);
handle->cur_swap = offset;
handle->k = 0;
}
+ if (++handle->written > (handle->nr_free_pages >> 1)) {
+ error = hib_wait_on_bio_chain(bio_chain);
+ if (error)
+ goto out;
+ handle->written = 0;
+ }
out:
return error;
}
@@ -372,6 +421,13 @@ static int swap_writer_finish(struct swap_map_handle *handle,
LZO_HEADER, PAGE_SIZE)
#define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE)

+/* Maximum number of threads for compression/decompression. */
+#define LZO_THREADS 3
+
+/* Maximum number of pages for read buffering. */
+#define LZO_READ_PAGES (MAP_PAGE_ENTRIES * 4)
+
+
/**
* save_image - save the suspend image data
*/
@@ -419,6 +475,50 @@ static int save_image(struct swap_map_handle *handle,
return ret;
}

+/**
+ * Structure used for LZO data compression.
+ */
+struct cmp_data {
+ struct task_struct *thr; /* thread */
+ atomic_t ready; /* ready to start flag */
+ atomic_t stop; /* ready to stop flag */
+ int ret; /* return code */
+ wait_queue_head_t go; /* start compression */
+ wait_queue_head_t done; /* compression done */
+ size_t unc_len; /* uncompressed length */
+ size_t cmp_len; /* compressed length */
+ unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */
+ unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */
+ unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */
+};
+
+/**
+ * Compression function that runs in its own thread.
+ */
+static int lzo_compress_threadfn(void *data)
+{
+ struct cmp_data *d = data;
+
+ while (1) {
+ wait_event(d->go, atomic_read(&d->ready) ||
+ kthread_should_stop());
+ if (kthread_should_stop()) {
+ d->thr = NULL;
+ d->ret = -1;
+ atomic_set(&d->stop, 1);
+ wake_up(&d->done);
+ break;
+ }
+ atomic_set(&d->ready, 0);
+
+ d->ret = lzo1x_1_compress(d->unc, d->unc_len,
+ d->cmp + LZO_HEADER, &d->cmp_len,
+ d->wrk);
+ atomic_set(&d->stop, 1);
+ wake_up(&d->done);
+ }
+ return 0;
+}

/**
* save_image_lzo - Save the suspend image data compressed with LZO.
@@ -437,42 +537,65 @@ static int save_image_lzo(struct swap_map_handle *handle,
struct bio *bio;
struct timeval start;
struct timeval stop;
- size_t off, unc_len, cmp_len;
- unsigned char *unc, *cmp, *wrk, *page;
+ size_t off, thr, run_threads, nr_threads;
+ unsigned char *page = NULL;
+ struct cmp_data *data = NULL;
+
+ /*
+ * We'll limit the number of threads for compression to limit memory
+ * footprint.
+ */
+ nr_threads = num_online_cpus() - 1;
+ if (nr_threads > LZO_THREADS)
+ nr_threads = LZO_THREADS;
+ else if (nr_threads < 1)
+ nr_threads = 1;

page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
if (!page) {
printk(KERN_ERR "PM: Failed to allocate LZO page\n");
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out_clean;
}

- 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;
+ data = vmalloc(sizeof(*data) * nr_threads);
+ if (!data) {
+ printk(KERN_ERR "PM: Failed to allocate LZO data\n");
+ ret = -ENOMEM;
+ goto out_clean;
}
-
- unc = vmalloc(LZO_UNC_SIZE);
- if (!unc) {
- printk(KERN_ERR "PM: Failed to allocate LZO uncompressed\n");
- vfree(wrk);
- free_page((unsigned long)page);
- return -ENOMEM;
+ for (thr = 0; thr < nr_threads; thr++)
+ memset(&data[thr], 0, offsetof(struct cmp_data, go));
+
+ /*
+ * Start the compression threads.
+ */
+ for (thr = 0; thr < nr_threads; thr++) {
+ init_waitqueue_head(&data[thr].go);
+ init_waitqueue_head(&data[thr].done);
+
+ data[thr].thr = kthread_run(lzo_compress_threadfn,
+ &data[thr],
+ "image_compress/%zu", thr);
+ if (IS_ERR(data[thr].thr)) {
+ nr_threads = thr;
+ printk(KERN_ERR
+ "PM: Cannot start compression threads\n");
+ ret = -ENOMEM;
+ goto out_clean;
+ }
}

- cmp = vmalloc(LZO_CMP_SIZE);
- if (!cmp) {
- printk(KERN_ERR "PM: Failed to allocate LZO compressed\n");
- vfree(unc);
- vfree(wrk);
- free_page((unsigned long)page);
- return -ENOMEM;
- }
+ /*
+ * 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();

printk(KERN_INFO
+ "PM: Using %zu thread(s) for compression.\n"
"PM: Compressing and saving image data (%u pages) ... ",
- nr_to_write);
+ nr_threads, nr_to_write);
m = nr_to_write / 100;
if (!m)
m = 1;
@@ -480,54 +603,80 @@ static int save_image_lzo(struct swap_map_handle *handle,
bio = NULL;
do_gettimeofday(&start);
for (;;) {
- for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) {
- ret = snapshot_read_next(snapshot);
- if (ret < 0)
- goto out_finish;
-
- if (!ret)
+ for (thr = 0; thr < nr_threads; thr++) {
+ for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) {
+ ret = snapshot_read_next(snapshot);
+ if (ret < 0)
+ goto out_finish;
+
+ if (!ret)
+ break;
+
+ sg_set_buf(&handle->sg,
+ data_of(*snapshot), PAGE_SIZE);
+ crypto_hash_update(&handle->desc,
+ &handle->sg, PAGE_SIZE);
+
+ memcpy(data[thr].unc + off,
+ data_of(*snapshot), PAGE_SIZE);
+
+ if (!(nr_pages % m))
+ printk(KERN_CONT "\b\b\b\b%3d%%",
+ nr_pages / m);
+ nr_pages++;
+ }
+ if (!off)
break;

- memcpy(unc + off, data_of(*snapshot), PAGE_SIZE);
+ data[thr].unc_len = off;

- if (!(nr_pages % m))
- printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m);
- nr_pages++;
+ atomic_set(&data[thr].ready, 1);
+ wake_up(&data[thr].go);
}

- if (!off)
+ if (!thr)
break;

- unc_len = off;
- ret = lzo1x_1_compress(unc, unc_len,
- cmp + LZO_HEADER, &cmp_len, wrk);
- if (ret < 0) {
- printk(KERN_ERR "PM: LZO compression failed\n");
- break;
- }
+ for (run_threads = thr, thr = 0; thr < run_threads; thr++) {
+ wait_event(data[thr].done,
+ atomic_read(&data[thr].stop));
+ atomic_set(&data[thr].stop, 0);

- if (unlikely(!cmp_len ||
- cmp_len > lzo1x_worst_compress(unc_len))) {
- printk(KERN_ERR "PM: Invalid LZO compressed length\n");
- ret = -1;
- break;
- }
+ ret = data[thr].ret;

- *(size_t *)cmp = cmp_len;
-
- /*
- * Given we are writing one page at a time to disk, we copy
- * that much from the buffer, although the last bit will likely
- * be smaller than full page. This is OK - we saved the length
- * of the compressed data, so any garbage at the end will be
- * discarded when we read it.
- */
- for (off = 0; off < LZO_HEADER + cmp_len; off += PAGE_SIZE) {
- memcpy(page, cmp + off, PAGE_SIZE);
+ if (ret < 0) {
+ printk(KERN_ERR "PM: LZO compression failed\n");
+ goto out_finish;
+ }

- ret = swap_write_page(handle, page, &bio);
- if (ret)
+ if (unlikely(!data[thr].cmp_len ||
+ data[thr].cmp_len >
+ lzo1x_worst_compress(data[thr].unc_len))) {
+ printk(KERN_ERR
+ "PM: Invalid LZO compressed length\n");
+ ret = -1;
goto out_finish;
+ }
+
+ *(size_t *)data[thr].cmp = data[thr].cmp_len;
+
+ /*
+ * Given we are writing one page at a time to disk, we
+ * copy that much from the buffer, although the last
+ * bit will likely be smaller than full page. This is
+ * OK - we saved the length of the compressed data, so
+ * any garbage at the end will be discarded when we
+ * read it.
+ */
+ for (off = 0;
+ off < LZO_HEADER + data[thr].cmp_len;
+ off += PAGE_SIZE) {
+ memcpy(page, data[thr].cmp + off, PAGE_SIZE);
+
+ ret = swap_write_page(handle, page, &bio);
+ if (ret)
+ goto out_finish;
+ }
}
}

@@ -536,16 +685,20 @@ out_finish:
do_gettimeofday(&stop);
if (!ret)
ret = err2;
- if (!ret)
+ if (!ret) {
printk(KERN_CONT "\b\b\b\bdone\n");
- else
+ crypto_hash_final(&handle->desc, handle->digest);
+ } else {
printk(KERN_CONT "\n");
+ }
swsusp_show_speed(&start, &stop, nr_to_write, "Wrote");
-
- vfree(cmp);
- vfree(unc);
- vfree(wrk);
- free_page((unsigned long)page);
+out_clean:
+ for (thr = 0; thr < nr_threads; thr++) {
+ if (data[thr].thr)
+ kthread_stop(data[thr].thr);
+ }
+ if (data) vfree(data);
+ if (page) free_page((unsigned long)page);

return ret;
}
@@ -625,31 +778,79 @@ out_finish:

static void release_swap_reader(struct swap_map_handle *handle)
{
+ struct swap_map_page_list *tmp;
+
if (handle->cur)
free_page((unsigned long)handle->cur);
+ while (handle->maps) {
+ if (handle->maps->map)
+ free_page((unsigned long)handle->maps->map);
+ tmp = handle->maps;
+ handle->maps = handle->maps->next;
+ vfree(tmp);
+ }
handle->cur = NULL;
+ handle->maps = NULL;
+ if (handle->tfm) {
+ crypto_free_hash(handle->tfm);
+ handle->tfm = NULL;
+ }
}

static int get_swap_reader(struct swap_map_handle *handle,
unsigned int *flags_p)
{
int error;
+ struct swap_map_page_list *tmp, *last;
+ sector_t offset;

*flags_p = swsusp_header->flags;

if (!swsusp_header->image) /* how can this happen? */
return -EINVAL;

- handle->cur = (struct swap_map_page *)get_zeroed_page(__GFP_WAIT | __GFP_HIGH);
- if (!handle->cur)
- return -ENOMEM;
+ handle->cur = NULL;
+ last = handle->maps = NULL;
+ offset = swsusp_header->image;
+ while (offset) {
+ tmp = vmalloc(sizeof(*handle->maps));
+ if (!tmp) {
+ release_swap_reader(handle);
+ return -ENOMEM;
+ }
+ memset(tmp, 0, sizeof(*tmp));
+ if (!handle->maps)
+ handle->maps = tmp;
+ if (last)
+ last->next = tmp;
+ last = tmp;
+
+ tmp->map = (struct swap_map_page *)
+ __get_free_page(__GFP_WAIT | __GFP_HIGH);
+ if (!tmp->map) {
+ release_swap_reader(handle);
+ return -ENOMEM;
+ }

- error = hib_bio_read_page(swsusp_header->image, handle->cur, NULL);
- if (error) {
- release_swap_reader(handle);
- return error;
+ error = hib_bio_read_page(offset, tmp->map, NULL);
+ if (error) {
+ release_swap_reader(handle);
+ return error;
+ }
+ offset = tmp->map->next_swap;
}
handle->k = 0;
+ handle->cur = handle->maps->map;
+ handle->tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(handle->tfm)) {
+ handle->tfm = NULL;
+ release_swap_reader(handle);
+ return -ENOMEM;
+ }
+ handle->desc.tfm = handle->tfm;
+ handle->desc.flags = 0;
+ crypto_hash_init(&handle->desc);
+ sg_init_table(&handle->sg, 1);
return 0;
}

@@ -658,6 +859,7 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf,
{
sector_t offset;
int error;
+ struct swap_map_page_list *tmp;

if (!handle->cur)
return -EINVAL;
@@ -668,13 +870,15 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf,
if (error)
return error;
if (++handle->k >= MAP_PAGE_ENTRIES) {
- error = hib_wait_on_bio_chain(bio_chain);
handle->k = 0;
- offset = handle->cur->next_swap;
- if (!offset)
+ free_page((unsigned long)handle->maps->map);
+ tmp = handle->maps;
+ handle->maps = handle->maps->next;
+ vfree(tmp);
+ if (!handle->maps)
release_swap_reader(handle);
- else if (!error)
- error = hib_bio_read_page(offset, handle->cur, NULL);
+ else
+ handle->cur = handle->maps->map;
}
return error;
}
@@ -743,6 +947,50 @@ static int load_image(struct swap_map_handle *handle,
}

/**
+ * Structure used for LZO data decompression.
+ */
+struct dec_data {
+ struct task_struct *thr; /* thread */
+ atomic_t ready; /* ready to start flag */
+ atomic_t stop; /* ready to stop flag */
+ int ret; /* return code */
+ wait_queue_head_t go; /* start decompression */
+ wait_queue_head_t done; /* decompression done */
+ size_t unc_len; /* uncompressed length */
+ size_t cmp_len; /* compressed length */
+ unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */
+ unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */
+};
+
+/**
+ * Deompression function that runs in its own thread.
+ */
+static int lzo_decompress_threadfn(void *data)
+{
+ struct dec_data *d = data;
+
+ while (1) {
+ wait_event(d->go, atomic_read(&d->ready) ||
+ kthread_should_stop());
+ if (kthread_should_stop()) {
+ d->thr = NULL;
+ d->ret = -1;
+ atomic_set(&d->stop, 1);
+ wake_up(&d->done);
+ break;
+ }
+ atomic_set(&d->ready, 0);
+
+ d->unc_len = LZO_UNC_SIZE;
+ d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len,
+ d->unc, &d->unc_len);
+ atomic_set(&d->stop, 1);
+ wake_up(&d->done);
+ }
+ return 0;
+}
+
+/**
* load_image_lzo - Load compressed image data and decompress them with LZO.
* @handle: Swap map handle to use for loading data.
* @snapshot: Image to copy uncompressed data into.
@@ -754,49 +1002,81 @@ static int load_image_lzo(struct swap_map_handle *handle,
{
unsigned int m;
int error = 0;
+ int eof = 0;
struct bio *bio;
struct timeval start;
struct timeval stop;
unsigned nr_pages;
- size_t i, off, unc_len, cmp_len;
- unsigned char *unc, *cmp, *page[LZO_CMP_PAGES];
-
- for (i = 0; i < LZO_CMP_PAGES; i++) {
- page[i] = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
- if (!page[i]) {
- printk(KERN_ERR "PM: Failed to allocate LZO page\n");
-
- while (i)
- free_page((unsigned long)page[--i]);
-
- return -ENOMEM;
- }
+ size_t i, off, thr, run_threads, nr_threads;
+ size_t ring = 0, pg = 0, ring_size = 0, have = 0, want, need, asked = 0;
+ unsigned char **page = NULL;
+ struct dec_data *data = NULL;
+
+ /*
+ * We'll limit the number of threads for decompression to limit memory
+ * footprint.
+ */
+ nr_threads = num_online_cpus() - 1;
+ if (nr_threads > LZO_THREADS)
+ nr_threads = LZO_THREADS;
+ else if (nr_threads < 1)
+ nr_threads = 1;
+
+ page = vmalloc(sizeof(*page) * LZO_READ_PAGES);
+ if (!page) {
+ printk(KERN_ERR "PM: Failed to allocate LZO page\n");
+ error = -ENOMEM;
+ goto out_clean;
}

- unc = vmalloc(LZO_UNC_SIZE);
- if (!unc) {
- printk(KERN_ERR "PM: Failed to allocate LZO uncompressed\n");
-
- for (i = 0; i < LZO_CMP_PAGES; i++)
- free_page((unsigned long)page[i]);
-
- return -ENOMEM;
+ data = vmalloc(sizeof(*data) * nr_threads);
+ if (!data) {
+ printk(KERN_ERR "PM: Failed to allocate LZO data\n");
+ error = -ENOMEM;
+ goto out_clean;
+ }
+ for (thr = 0; thr < nr_threads; thr++)
+ memset(&data[thr], 0, offsetof(struct dec_data, go));
+
+ /*
+ * Start the decompression threads.
+ */
+ for (thr = 0; thr < nr_threads; thr++) {
+ init_waitqueue_head(&data[thr].go);
+ init_waitqueue_head(&data[thr].done);
+
+ data[thr].thr = kthread_run(lzo_decompress_threadfn,
+ &data[thr],
+ "image_decompress/%zu", thr);
+ if (IS_ERR(data[thr].thr)) {
+ nr_threads = thr;
+ printk(KERN_ERR
+ "PM: Cannot start decompression threads\n");
+ error = -ENOMEM;
+ goto out_clean;
+ }
}

- cmp = vmalloc(LZO_CMP_SIZE);
- if (!cmp) {
- printk(KERN_ERR "PM: Failed to allocate LZO compressed\n");
-
- vfree(unc);
- for (i = 0; i < LZO_CMP_PAGES; i++)
- free_page((unsigned long)page[i]);
-
- return -ENOMEM;
+ for (i = 0; i < LZO_READ_PAGES; i++) {
+ page[i] = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
+ if (!page[i]) {
+ if (i < LZO_CMP_PAGES) {
+ ring_size = i;
+ printk(KERN_ERR
+ "PM: Failed to allocate LZO pages\n");
+ error = -ENOMEM;
+ goto out_clean;
+ } else {
+ break;
+ }
+ }
}
+ want = ring_size = i;

printk(KERN_INFO
+ "PM: Using %zu thread(s) for decompression.\n"
"PM: Loading and decompressing image data (%u pages) ... ",
- nr_to_read);
+ nr_threads, nr_to_read);
m = nr_to_read / 100;
if (!m)
m = 1;
@@ -808,61 +1088,133 @@ static int load_image_lzo(struct swap_map_handle *handle,
if (error <= 0)
goto out_finish;

- for (;;) {
- error = swap_read_page(handle, page[0], NULL); /* sync */
- if (error)
- break;
-
- cmp_len = *(size_t *)page[0];
- if (unlikely(!cmp_len ||
- cmp_len > lzo1x_worst_compress(LZO_UNC_SIZE))) {
- printk(KERN_ERR "PM: Invalid LZO compressed length\n");
- error = -1;
- break;
+ for(;;) {
+ for (i = 0; !eof && i < want; i++) {
+ error = swap_read_page(handle, page[ring], &bio);
+ if (error) {
+ /*
+ * On real read error, finish. On end of data,
+ * set EOF flag and just exit the read loop.
+ */
+ if (handle->cur &&
+ handle->cur->entries[handle->k]) {
+ goto out_finish;
+ } else {
+ eof = 1;
+ break;
+ }
+ }
+ if (++ring >= ring_size)
+ ring = 0;
}
+ asked += i;
+ want -= i;

- for (off = PAGE_SIZE, i = 1;
- off < LZO_HEADER + cmp_len; off += PAGE_SIZE, i++) {
- error = swap_read_page(handle, page[i], &bio);
+ /*
+ * We are out of data, wait for some more.
+ */
+ if (!have) {
+ if (!asked)
+ break;
+
+ error = hib_wait_on_bio_chain(&bio);
if (error)
goto out_finish;
+ have += asked;
+ asked = 0;
+ if (eof)
+ eof = 2;
}

- error = hib_wait_on_bio_chain(&bio); /* need all data now */
- if (error)
- goto out_finish;
+ for (thr = 0; have && thr < nr_threads; thr++) {
+ data[thr].cmp_len = *(size_t *)page[pg];
+ if (unlikely(!data[thr].cmp_len ||
+ data[thr].cmp_len >
+ lzo1x_worst_compress(LZO_UNC_SIZE))) {
+ printk(KERN_ERR
+ "PM: Invalid LZO compressed length\n");
+ error = -1;
+ goto out_finish;
+ }

- for (off = 0, i = 0;
- off < LZO_HEADER + cmp_len; off += PAGE_SIZE, i++) {
- memcpy(cmp + off, page[i], PAGE_SIZE);
- }
+ need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER,
+ PAGE_SIZE);
+ if (need > have) {
+ if (eof > 1) {
+ error = -1;
+ goto out_finish;
+ }
+ break;
+ }

- unc_len = LZO_UNC_SIZE;
- error = lzo1x_decompress_safe(cmp + LZO_HEADER, cmp_len,
- unc, &unc_len);
- if (error < 0) {
- printk(KERN_ERR "PM: LZO decompression failed\n");
- break;
+ for (off = 0;
+ off < LZO_HEADER + data[thr].cmp_len;
+ off += PAGE_SIZE) {
+ memcpy(data[thr].cmp + off,
+ page[pg], PAGE_SIZE);
+ have--;
+ want++;
+ if (++pg >= ring_size)
+ pg = 0;
+ }
+
+ atomic_set(&data[thr].ready, 1);
+ wake_up(&data[thr].go);
}

- if (unlikely(!unc_len ||
- unc_len > LZO_UNC_SIZE ||
- unc_len & (PAGE_SIZE - 1))) {
- printk(KERN_ERR "PM: Invalid LZO uncompressed length\n");
- error = -1;
- break;
+ /*
+ * Wait for more data while we are decompressing.
+ */
+ if (have < LZO_CMP_PAGES && asked) {
+ error = hib_wait_on_bio_chain(&bio);
+ if (error)
+ goto out_finish;
+ have += asked;
+ asked = 0;
+ if (eof)
+ eof = 2;
}

- for (off = 0; off < unc_len; off += PAGE_SIZE) {
- memcpy(data_of(*snapshot), unc + off, PAGE_SIZE);
+ for (run_threads = thr, thr = 0; thr < run_threads; thr++) {
+ wait_event(data[thr].done,
+ atomic_read(&data[thr].stop));
+ atomic_set(&data[thr].stop, 0);
+
+ error = data[thr].ret;

- if (!(nr_pages % m))
- printk("\b\b\b\b%3d%%", nr_pages / m);
- nr_pages++;
+ if (error < 0) {
+ printk(KERN_ERR
+ "PM: LZO decompression failed\n");
+ goto out_finish;
+ }

- error = snapshot_write_next(snapshot);
- if (error <= 0)
+ if (unlikely(!data[thr].unc_len ||
+ data[thr].unc_len > LZO_UNC_SIZE ||
+ data[thr].unc_len & (PAGE_SIZE - 1))) {
+ printk(KERN_ERR
+ "PM: Invalid LZO uncompressed length\n");
+ error = -1;
goto out_finish;
+ }
+
+ for (off = 0;
+ off < data[thr].unc_len; off += PAGE_SIZE) {
+ memcpy(data_of(*snapshot),
+ data[thr].unc + off, PAGE_SIZE);
+
+ if (!(nr_pages % m))
+ printk("\b\b\b\b%3d%%", nr_pages / m);
+ nr_pages++;
+
+ sg_set_buf(&handle->sg,
+ data_of(*snapshot), PAGE_SIZE);
+ crypto_hash_update(&handle->desc,
+ &handle->sg, PAGE_SIZE);
+
+ error = snapshot_write_next(snapshot);
+ if (error <= 0)
+ goto out_finish;
+ }
}
}

@@ -873,14 +1225,27 @@ out_finish:
snapshot_write_finalize(snapshot);
if (!snapshot_image_loaded(snapshot))
error = -ENODATA;
+ if (!error) {
+ crypto_hash_final(&handle->desc, handle->digest);
+ if(memcmp(handle->digest,
+ swsusp_header->digest, SHA1_DIGEST_SIZE)) {
+ printk(KERN_ERR
+ "PM: Invalid image checksum!\n");
+ error = -ENODATA;
+ }
+ }
} else
printk("\n");
swsusp_show_speed(&start, &stop, nr_to_read, "Read");
-
- vfree(cmp);
- vfree(unc);
- for (i = 0; i < LZO_CMP_PAGES; i++)
+out_clean:
+ for (i = 0; i < ring_size; i++)
free_page((unsigned long)page[i]);
+ for (thr = 0; thr < nr_threads; thr++) {
+ if (data[thr].thr)
+ kthread_stop(data[thr].thr);
+ }
+ if (data) vfree(data);
+ if (page) vfree(page);

return error;
}
----------------------------------------
--
Bojan



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