From 546e0d271941dd1ff6961e2a1f7eac75f1fc277e Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Mon, 25 Sep 2006 23:32:44 -0700 Subject: [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 Cc: "Rafael J. Wysocki" Cc: Jens Axboe Cc: Laurent Riffard Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/power/snapshot.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'kernel/power/snapshot.c') diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 75d4886..591301a 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -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; } -- cgit v1.1