mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-31 18:09:19 +00:00
[PATCH] swsusp: read speedup
Implement async reads for swsusp resuming. Crufty old PIII testbox: 15.7 MB/s -> 20.3 MB/s Sony Vaio: 14.6 MB/s -> 33.3 MB/s I didn't implement the post-resume bio_set_pages_dirty(). I don't really understand why resume needs to run set_page_dirty() against these pages. It might be a worry that this code modifies PG_Uptodate, PG_Error and PG_Locked against the image pages. Can this possibly affect the resumed-into kernel? Hopefully not, if we're atomically restoring its mem_map? Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Jens Axboe <axboe@suse.de> Cc: Laurent Riffard <laurent.riffard@free.fr> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrew Morton
Linus Torvalds
parent
8c002494b5
commit
546e0d2719
5 changed files with 81 additions and 72 deletions
|
|
@ -220,6 +220,7 @@ extern int swap_readpage(struct file *, struct page *);
|
|||
extern int swap_writepage(struct page *page, struct writeback_control *wbc);
|
||||
extern int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page,
|
||||
struct bio **bio_chain);
|
||||
extern int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err);
|
||||
|
||||
/* linux/mm/swap_state.c */
|
||||
extern struct address_space swapper_space;
|
||||
|
|
|
|||
|
|
@ -58,6 +58,7 @@ struct snapshot_handle {
|
|||
struct pbe *pbe, *last_pbe;
|
||||
void *buffer;
|
||||
unsigned int buf_offset;
|
||||
int sync_read;
|
||||
};
|
||||
|
||||
#define data_of(handle) ((handle).buffer + (handle).buf_offset)
|
||||
|
|
|
|||
|
|
@ -314,7 +314,7 @@ static unsigned int unsafe_pages;
|
|||
* and we count them using unsafe_pages
|
||||
*/
|
||||
|
||||
static inline void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
|
||||
static void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
|
||||
{
|
||||
void *res;
|
||||
|
||||
|
|
@ -828,13 +828,16 @@ int snapshot_write_next(struct snapshot_handle *handle, size_t count)
|
|||
}
|
||||
if (!handle->offset)
|
||||
handle->buffer = buffer;
|
||||
handle->sync_read = 1;
|
||||
if (handle->prev < handle->page) {
|
||||
if (!handle->prev) {
|
||||
error = load_header(handle, (struct swsusp_info *)buffer);
|
||||
error = load_header(handle,
|
||||
(struct swsusp_info *)buffer);
|
||||
if (error)
|
||||
return error;
|
||||
} else if (handle->prev <= nr_meta_pages) {
|
||||
handle->pbe = unpack_orig_addresses(buffer, handle->pbe);
|
||||
handle->pbe = unpack_orig_addresses(buffer,
|
||||
handle->pbe);
|
||||
if (!handle->pbe) {
|
||||
error = prepare_image(handle);
|
||||
if (error)
|
||||
|
|
@ -842,10 +845,12 @@ int snapshot_write_next(struct snapshot_handle *handle, size_t count)
|
|||
handle->pbe = pagedir_nosave;
|
||||
handle->last_pbe = NULL;
|
||||
handle->buffer = get_buffer(handle);
|
||||
handle->sync_read = 0;
|
||||
}
|
||||
} else {
|
||||
handle->pbe = handle->pbe->next;
|
||||
handle->buffer = get_buffer(handle);
|
||||
handle->sync_read = 0;
|
||||
}
|
||||
handle->prev = handle->page;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -22,6 +22,7 @@
|
|||
#include <linux/device.h>
|
||||
#include <linux/buffer_head.h>
|
||||
#include <linux/bio.h>
|
||||
#include <linux/blkdev.h>
|
||||
#include <linux/swap.h>
|
||||
#include <linux/swapops.h>
|
||||
#include <linux/pm.h>
|
||||
|
|
@ -214,6 +215,8 @@ static int wait_on_bio_chain(struct bio **bio_chain)
|
|||
return 0;
|
||||
|
||||
bio = *bio_chain;
|
||||
if (bio == NULL)
|
||||
return 0;
|
||||
while (bio) {
|
||||
struct page *page;
|
||||
|
||||
|
|
@ -349,7 +352,8 @@ int swsusp_write(void)
|
|||
int error;
|
||||
|
||||
if ((error = swsusp_swap_check())) {
|
||||
printk(KERN_ERR "swsusp: Cannot find swap device, try swapon -a.\n");
|
||||
printk(KERN_ERR "swsusp: Cannot find swap device, try "
|
||||
"swapon -a.\n");
|
||||
return error;
|
||||
}
|
||||
memset(&snapshot, 0, sizeof(struct snapshot_handle));
|
||||
|
|
@ -381,27 +385,6 @@ int swsusp_write(void)
|
|||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Using bio to read from swap.
|
||||
* This code requires a bit more work than just using buffer heads
|
||||
* but, it is the recommended way for 2.5/2.6.
|
||||
* The following are to signal the beginning and end of I/O. Bios
|
||||
* finish asynchronously, while we want them to happen synchronously.
|
||||
* A simple atomic_t, and a wait loop take care of this problem.
|
||||
*/
|
||||
|
||||
static atomic_t io_done = ATOMIC_INIT(0);
|
||||
|
||||
static int end_io(struct bio *bio, unsigned int num, int err)
|
||||
{
|
||||
if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
|
||||
printk(KERN_ERR "I/O error reading swsusp image.\n");
|
||||
return -EIO;
|
||||
}
|
||||
atomic_set(&io_done, 0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct block_device *resume_bdev;
|
||||
|
||||
/**
|
||||
|
|
@ -409,15 +392,15 @@ static struct block_device *resume_bdev;
|
|||
* @rw: READ or WRITE.
|
||||
* @off physical offset of page.
|
||||
* @page: page we're reading or writing.
|
||||
* @bio_chain: list of pending biod (for async reading)
|
||||
*
|
||||
* Straight from the textbook - allocate and initialize the bio.
|
||||
* If we're writing, make sure the page is marked as dirty.
|
||||
* Then submit it and wait.
|
||||
* If we're reading, make sure the page is marked as dirty.
|
||||
* Then submit it and, if @bio_chain == NULL, wait.
|
||||
*/
|
||||
|
||||
static int submit(int rw, pgoff_t page_off, void *page)
|
||||
static int submit(int rw, pgoff_t page_off, struct page *page,
|
||||
struct bio **bio_chain)
|
||||
{
|
||||
int error = 0;
|
||||
struct bio *bio;
|
||||
|
||||
bio = bio_alloc(GFP_ATOMIC, 1);
|
||||
|
|
@ -425,33 +408,40 @@ static int submit(int rw, pgoff_t page_off, void *page)
|
|||
return -ENOMEM;
|
||||
bio->bi_sector = page_off * (PAGE_SIZE >> 9);
|
||||
bio->bi_bdev = resume_bdev;
|
||||
bio->bi_end_io = end_io;
|
||||
bio->bi_end_io = end_swap_bio_read;
|
||||
|
||||
if (bio_add_page(bio, virt_to_page(page), PAGE_SIZE, 0) < PAGE_SIZE) {
|
||||
printk("swsusp: ERROR: adding page to bio at %ld\n",page_off);
|
||||
error = -EFAULT;
|
||||
goto Done;
|
||||
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
|
||||
printk("swsusp: ERROR: adding page to bio at %ld\n", page_off);
|
||||
bio_put(bio);
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
atomic_set(&io_done, 1);
|
||||
submit_bio(rw | (1 << BIO_RW_SYNC), bio);
|
||||
while (atomic_read(&io_done))
|
||||
yield();
|
||||
if (rw == READ)
|
||||
bio_set_pages_dirty(bio);
|
||||
Done:
|
||||
bio_put(bio);
|
||||
return error;
|
||||
lock_page(page);
|
||||
bio_get(bio);
|
||||
|
||||
if (bio_chain == NULL) {
|
||||
submit_bio(rw | (1 << BIO_RW_SYNC), bio);
|
||||
wait_on_page_locked(page);
|
||||
if (rw == READ)
|
||||
bio_set_pages_dirty(bio);
|
||||
bio_put(bio);
|
||||
} else {
|
||||
get_page(page);
|
||||
bio->bi_private = *bio_chain;
|
||||
*bio_chain = bio;
|
||||
submit_bio(rw | (1 << BIO_RW_SYNC), bio);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bio_read_page(pgoff_t page_off, void *page)
|
||||
static int bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
|
||||
{
|
||||
return submit(READ, page_off, page);
|
||||
return submit(READ, page_off, virt_to_page(addr), bio_chain);
|
||||
}
|
||||
|
||||
static int bio_write_page(pgoff_t page_off, void *page)
|
||||
static int bio_write_page(pgoff_t page_off, void *addr)
|
||||
{
|
||||
return submit(WRITE, page_off, page);
|
||||
return submit(WRITE, page_off, virt_to_page(addr), NULL);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -476,7 +466,7 @@ static int get_swap_reader(struct swap_map_handle *handle,
|
|||
handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_ATOMIC);
|
||||
if (!handle->cur)
|
||||
return -ENOMEM;
|
||||
error = bio_read_page(swp_offset(start), handle->cur);
|
||||
error = bio_read_page(swp_offset(start), handle->cur, NULL);
|
||||
if (error) {
|
||||
release_swap_reader(handle);
|
||||
return error;
|
||||
|
|
@ -485,7 +475,8 @@ static int get_swap_reader(struct swap_map_handle *handle,
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int swap_read_page(struct swap_map_handle *handle, void *buf)
|
||||
static int swap_read_page(struct swap_map_handle *handle, void *buf,
|
||||
struct bio **bio_chain)
|
||||
{
|
||||
unsigned long offset;
|
||||
int error;
|
||||
|
|
@ -495,16 +486,17 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf)
|
|||
offset = handle->cur->entries[handle->k];
|
||||
if (!offset)
|
||||
return -EFAULT;
|
||||
error = bio_read_page(offset, buf);
|
||||
error = bio_read_page(offset, buf, bio_chain);
|
||||
if (error)
|
||||
return error;
|
||||
if (++handle->k >= MAP_PAGE_ENTRIES) {
|
||||
error = wait_on_bio_chain(bio_chain);
|
||||
handle->k = 0;
|
||||
offset = handle->cur->next_swap;
|
||||
if (!offset)
|
||||
release_swap_reader(handle);
|
||||
else
|
||||
error = bio_read_page(offset, handle->cur);
|
||||
else if (!error)
|
||||
error = bio_read_page(offset, handle->cur, NULL);
|
||||
}
|
||||
return error;
|
||||
}
|
||||
|
|
@ -517,38 +509,48 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf)
|
|||
|
||||
static int load_image(struct swap_map_handle *handle,
|
||||
struct snapshot_handle *snapshot,
|
||||
unsigned int nr_pages)
|
||||
unsigned int nr_to_read)
|
||||
{
|
||||
unsigned int m;
|
||||
int ret;
|
||||
int error = 0;
|
||||
struct timeval start;
|
||||
struct timeval stop;
|
||||
struct bio *bio;
|
||||
int err2;
|
||||
unsigned nr_pages;
|
||||
|
||||
printk("Loading image data pages (%u pages) ... ", nr_pages);
|
||||
m = nr_pages / 100;
|
||||
printk("Loading image data pages (%u pages) ... ", nr_to_read);
|
||||
m = nr_to_read / 100;
|
||||
if (!m)
|
||||
m = 1;
|
||||
nr_pages = 0;
|
||||
bio = NULL;
|
||||
do_gettimeofday(&start);
|
||||
do {
|
||||
ret = snapshot_write_next(snapshot, PAGE_SIZE);
|
||||
if (ret > 0) {
|
||||
error = swap_read_page(handle, data_of(*snapshot));
|
||||
if (error)
|
||||
break;
|
||||
if (!(nr_pages % m))
|
||||
printk("\b\b\b\b%3d%%", nr_pages / m);
|
||||
nr_pages++;
|
||||
}
|
||||
} while (ret > 0);
|
||||
for ( ; ; ) {
|
||||
error = snapshot_write_next(snapshot, PAGE_SIZE);
|
||||
if (error <= 0)
|
||||
break;
|
||||
error = swap_read_page(handle, data_of(*snapshot), &bio);
|
||||
if (error)
|
||||
break;
|
||||
if (snapshot->sync_read)
|
||||
error = wait_on_bio_chain(&bio);
|
||||
if (error)
|
||||
break;
|
||||
if (!(nr_pages % m))
|
||||
printk("\b\b\b\b%3d%%", nr_pages / m);
|
||||
nr_pages++;
|
||||
}
|
||||
err2 = wait_on_bio_chain(&bio);
|
||||
do_gettimeofday(&stop);
|
||||
if (!error)
|
||||
error = err2;
|
||||
if (!error) {
|
||||
printk("\b\b\b\bdone\n");
|
||||
if (!snapshot_image_loaded(snapshot))
|
||||
error = -ENODATA;
|
||||
}
|
||||
show_speed(&start, &stop, nr_pages, "Read");
|
||||
show_speed(&start, &stop, nr_to_read, "Read");
|
||||
return error;
|
||||
}
|
||||
|
||||
|
|
@ -571,7 +573,7 @@ int swsusp_read(void)
|
|||
header = (struct swsusp_info *)data_of(snapshot);
|
||||
error = get_swap_reader(&handle, swsusp_header.image);
|
||||
if (!error)
|
||||
error = swap_read_page(&handle, header);
|
||||
error = swap_read_page(&handle, header, NULL);
|
||||
if (!error)
|
||||
error = load_image(&handle, &snapshot, header->pages - 1);
|
||||
release_swap_reader(&handle);
|
||||
|
|
@ -597,7 +599,7 @@ int swsusp_check(void)
|
|||
if (!IS_ERR(resume_bdev)) {
|
||||
set_blocksize(resume_bdev, PAGE_SIZE);
|
||||
memset(&swsusp_header, 0, sizeof(swsusp_header));
|
||||
if ((error = bio_read_page(0, &swsusp_header)))
|
||||
if ((error = bio_read_page(0, &swsusp_header, NULL)))
|
||||
return error;
|
||||
if (!memcmp(SWSUSP_SIG, swsusp_header.sig, 10)) {
|
||||
memcpy(swsusp_header.sig, swsusp_header.orig_sig, 10);
|
||||
|
|
|
|||
|
|
@ -74,7 +74,7 @@ static int end_swap_bio_write(struct bio *bio, unsigned int bytes_done, int err)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err)
|
||||
int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err)
|
||||
{
|
||||
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
|
||||
struct page *page = bio->bi_io_vec[0].bv_page;
|
||||
|
|
|
|||
Loading…
Reference in a new issue