Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752599Ab0G3FAs (ORCPT ); Fri, 30 Jul 2010 01:00:48 -0400 Received: from beauty.rexursive.com ([150.101.121.179]:42131 "EHLO beauty.rexursive.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752041Ab0G3FAq (ORCPT ); Fri, 30 Jul 2010 01:00:46 -0400 X-Greylist: delayed 843 seconds by postgrey-1.27 at vger.kernel.org; Fri, 30 Jul 2010 01:00:46 EDT Subject: [PATCH]: Compress hibernation image with LZO (in-kernel) From: Bojan Smojver To: linux-kernel@vger.kernel.org Content-Type: multipart/mixed; boundary="=-KIqTVmqmrTRNAXPzqyNt" Date: Fri, 30 Jul 2010 14:46:41 +1000 Message-ID: <1280465201.2600.10.camel@shrek.rexursive.com> Mime-Version: 1.0 X-Mailer: Evolution 2.30.2 (2.30.2-1.fc13) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7803 Lines: 295 --=-KIqTVmqmrTRNAXPzqyNt Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit This patch speeds up hibernate/thaw operations (in kernel ones) by compressing the pages using LZO. Tests on my ThinkPad T510 show that hibernation times can be cut by the factor of about 4 for an image of around 1 GB (from about a minute down to about 15 seconds). I'm not really familiar with kernel internals, so many of the things in this patch could be very, very wrong. But go easy - this is essentially the first time I've attempted something like this. PS. I'm not on the list, so please CC me if you'd like to contact me. -- Bojan --=-KIqTVmqmrTRNAXPzqyNt Content-Disposition: attachment; filename="hibernate-lzo.patch" Content-Type: text/x-patch; name="hibernate-lzo.patch"; charset="UTF-8" Content-Transfer-Encoding: 7bit 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/swap.c b/kernel/power/swap.c index b0bb217..36dfdfb 100644 --- a/kernel/power/swap.c +++ b/kernel/power/swap.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "power.h" @@ -357,6 +358,12 @@ 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) /** * save_image - save the suspend image data */ @@ -372,6 +379,39 @@ static int save_image(struct swap_map_handle *handle, struct bio *bio; struct timeval start; struct timeval stop; + size_t ul, cl; + unsigned char *unc, *cmp; + void *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; + } + + 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; + } + + 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; + } printk(KERN_INFO "PM: Saving image data pages (%u pages) ... ", nr_to_write); @@ -382,16 +422,48 @@ 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(unc + 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(unc, ul, cmp + 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 *)cmp = cl; + + for (ul = 0; ul < LZO_HEADER + cl; ul += PAGE_SIZE) { + memcpy(page, cmp + 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 +473,12 @@ static int save_image(struct swap_map_handle *handle, 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); + return ret; } @@ -416,7 +494,8 @@ 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 + PAGES_FOR_IO; } /** @@ -550,6 +629,30 @@ static int load_image(struct swap_map_handle *handle, struct bio *bio; int err2; unsigned nr_pages; + size_t ul, cl; + unsigned char *unc, *cmp; + void *page; + + page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); + if (!page) { + printk(KERN_ERR "PM: Failed to allocate LZO page\n"); + return -ENOMEM; + } + + unc = vmalloc(LZO_UNC_SIZE); + if (!unc) { + printk(KERN_ERR "PM: Failed to allocate LZO uncompressed\n"); + free_page((unsigned long)page); + return -ENOMEM; + } + + cmp = vmalloc(LZO_CMP_SIZE); + if (!cmp) { + printk(KERN_ERR "PM: Failed to allocate LZO compressed\n"); + vfree(unc); + free_page((unsigned long)page); + return -ENOMEM; + } printk(KERN_INFO "PM: Loading image data pages (%u pages) ... ", nr_to_read); @@ -559,21 +662,52 @@ static int load_image(struct swap_map_handle *handle, 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) + memcpy(cmp, page, PAGE_SIZE); + + cl = *(size_t *)cmp; + 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++; + } + + 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(cmp + ul, page, PAGE_SIZE); + } + + ul = LZO_UNC_SIZE; + error = lzo1x_decompress_safe(cmp + LZO_HEADER, cl, unc, &ul); + if (error < 0) { + printk(KERN_ERR "PM: LZO decompression failed\n"); + break; + } + + for (cl = 0; cl < ul; cl += PAGE_SIZE) { + memcpy(data_of(*snapshot), unc + 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; + } } + +out_finish: err2 = hib_wait_on_bio_chain(&bio); do_gettimeofday(&stop); if (!error) @@ -586,6 +720,11 @@ static int load_image(struct swap_map_handle *handle, } else printk("\n"); swsusp_show_speed(&start, &stop, nr_to_read, "Read"); + + vfree(cmp); + vfree(unc); + free_page((unsigned long)page); + return error; } --=-KIqTVmqmrTRNAXPzqyNt-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/