From 19c055d73cee8e65f8c24393450014b3560a8c6a Mon Sep 17 00:00:00 2001 From: Manish Sharma <manishrma@gmail.com> Date: Mon, 1 Apr 2013 12:52:35 +0530 Subject: [RFC PATCH 1/1] Dual Squashfs: multicore implementation

The basic idea includes getting big requests by using readpages and then decompressing two blocks on each core. This implementation gives 50% improvement for the sequential file reads. 1.Split the two chunks based on the squashfs block size in readpages 2.Removed the locks of the decompressor(zlib/lzo) for percpu. 3.Increase the number of the data cache to per cpu. Points to consider:- 1. Need a lot of memory for the mutiple cache & multiple workspaces. 2. All the cpu will be too busy to process all the requests. cpu %usage increase. 3. Own queue method is implemented can be replaced with workqueues. 4. percpu data strucutures can be used. Signed-off-by: Manish Sharma <manishrma@gmail.com> --- fs/squashfs/Kconfig | 23 +++ fs/squashfs/Makefile | 1 + fs/squashfs/file.c | 250 ++++++++++++++++++++++++++++ fs/squashfs/lzo_wrapper.c | 113 ++++++++++++- fs/squashfs/squashfs_fs_sb.h | 6 +- fs/squashfs/super.c | 59 ++++++- fs/squashfs/tegra_mp.c | 368 ++++++++++++++++++++++++++++++++++++++++++ fs/squashfs/tegra_mp.h | 58 +++++++ fs/squashfs/zlib_wrapper.c | 160 +++++++++++++++++- 9 files changed, 1030 insertions(+), 8 deletions(-) create mode 100644 fs/squashfs/tegra_mp.c create mode 100644 fs/squashfs/tegra_mp.h diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig index c70111e..ffcf730 100644 --- a/fs/squashfs/Kconfig +++ b/fs/squashfs/Kconfig @@ -121,3 +121,26 @@ config SQUASHFS_FRAGMENT_CACHE_SIZE Note there must be at least one cached fragment. Anything much more than three will probably not make much difference. + +config SQUASHFS_READPAGES_ENABLE + bool "Enable Readpages for Squashfs" + depends on SQUASHFS + default n + help + Saying Y here enables readpages functionality. + If unsure, say N. + +config SQUASHFS_MPCORE + bool "Include Multi Core support in SquashFS file systems" + depends on SQUASHFS && SQUASHFS_READPAGES_ENABLE + default n + select SQUASHFS_4K_DEVBLK_SIZE + select TEGRA_MPCORE + help + Saying Y here includes support for Multi Core in SquashFS file systems + Multi Core supports creates the different kernel threads to improve the + SquashFS boot time performance. + This implementation is independent of the TEGRA board anyway as of now. + If unsure, say N. + + diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile index 110b047..0b99517 100644 --- a/fs/squashfs/Makefile +++ b/fs/squashfs/Makefile @@ -9,3 +9,4 @@ squashfs-$(CONFIG_SQUASHFS_XATTR) += xattr.o xattr_id.o squashfs-$(CONFIG_SQUASHFS_LZO) += lzo_wrapper.o squashfs-$(CONFIG_SQUASHFS_XZ) += xz_wrapper.o squashfs-$(CONFIG_SQUASHFS_ZLIB) += zlib_wrapper.o +squashfs-$(CONFIG_SQUASHFS_MPCORE) += tegra_mp.o diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c index 8ca62c2..c134e13 100644 --- a/fs/squashfs/file.c +++ b/fs/squashfs/file.c @@ -38,6 +38,11 @@ * Larger files use multiple slots, with 1.75 TiB files using all 8 slots. * The index cache is designed to be memory efficient, and by default uses * 16 KiB. + * + * manish.s2@samsung.com + * Added support for readpages for getting the bigger requests. + * Added Multithread support for the bigger chunks > squashfs block size + * */ #include <linux/fs.h> @@ -53,6 +58,22 @@ #include "squashfs_fs_i.h" #include "squashfs.h" +#ifdef CONFIG_SQUASHFS_MPCORE +#include "tegra_mp.h" + + +extern struct squashfs_queue *to_reader_1; +#endif /* CONFIG_SQUASHFS_MPCORE*/ + + + +#ifdef CONFIG_SQUASHFS_READPAGES_ENABLE +#define list_to_page(head) (list_entry((head)->prev, struct page, lru)) +#define list_to_page_index(pos, head, index) \ + for (pos = list_entry((head)->prev, struct page, lru); pos->index != index;\ + pos = list_entry((pos)->prev, struct page, lru)) +#endif + /* * Locate cache slot in range [offset, index] for specified inode. If * there's more than one return the slot closest to index. @@ -494,8 +515,237 @@ out: return 0; } +#ifdef CONFIG_SQUASHFS_READPAGES_ENABLE + +/* + * copy of squashfs_readpage function for + * supports + * readpages & Multicore implementation + */ +int read_this_page(struct file *file, struct page *page) +{ + struct inode *inode = page->mapping->host; + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; + int bytes, i, offset = 0, sparse = 0; + struct squashfs_cache_entry *buffer = NULL; + void *pageaddr; + + int mask = (1 << (msblk->block_log - PAGE_CACHE_SHIFT)) - 1; + int index = page->index >> (msblk->block_log - PAGE_CACHE_SHIFT); + int start_index = page->index & ~mask; + int end_index = start_index | mask; + int file_end = i_size_read(inode) >> msblk->block_log; + + TRACE("Entered read_this_page, page index %lx, start block %llx\n", + page->index, squashfs_i(inode)->start); + + + if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> + PAGE_CACHE_SHIFT)){ + goto out; + } + + if (index < file_end || squashfs_i(inode)->fragment_block == + SQUASHFS_INVALID_BLK) { + /* + * Reading a datablock from disk. Need to read block list + * to get location and block size. + */ + u64 block = 0; + int bsize = read_blocklist(inode, index, &block); + if (bsize < 0) + goto error_out; + + + if (bsize == 0) { /* hole */ + bytes = index == file_end ? + (i_size_read(inode) & (msblk->block_size - 1)) : + msblk->block_size; + sparse = 1; + } else { + /* + * Read and decompress datablock. + */ + buffer = squashfs_get_datablock(inode->i_sb, + block, bsize); + if (buffer->error) { + ERROR("Unable to read page, block %llx, size %x" + "\n", block, bsize); + squashfs_cache_put(buffer); + goto error_out; + } + bytes = buffer->length; + } + } else { + /* + * Datablock is stored inside a fragment (tail-end packed + * block). + */ + buffer = squashfs_get_fragment(inode->i_sb, + squashfs_i(inode)->fragment_block, + squashfs_i(inode)->fragment_size); + + if (buffer->error) { + ERROR("Unable to read page, block %llx, size %x\n", + squashfs_i(inode)->fragment_block, + squashfs_i(inode)->fragment_size); + squashfs_cache_put(buffer); + goto error_out; + } + bytes = i_size_read(inode) & (msblk->block_size - 1); + offset = squashfs_i(inode)->fragment_offset; + } + + /* + * Loop copying datablock into pages. As the datablock likely covers + * many PAGE_CACHE_SIZE pages (default block size is 128 KiB) explicitly + * grab the pages from the page cache, except for the page that we've + * been called to fill. + */ + for (i = start_index; i <= end_index && bytes > 0; i++, + bytes -= PAGE_CACHE_SIZE, offset += PAGE_CACHE_SIZE) { + struct page *push_page; + int avail = sparse ? 0 : min_t(int, bytes, PAGE_CACHE_SIZE); + + TRACE("bytes %d, i %d, available_bytes %d\n", bytes, i, avail); + + push_page = (i == page->index) ? page : + grab_cache_page_nowait(page->mapping, i); + + if (!push_page) + continue; + + if (PageUptodate(push_page)) + goto skip_page; + + pageaddr = kmap_atomic(push_page); + squashfs_copy_data(pageaddr, buffer, offset, avail); + memset(pageaddr + avail, 0, PAGE_CACHE_SIZE - avail); + kunmap_atomic(pageaddr); + flush_dcache_page(push_page); + SetPageUptodate(push_page); +skip_page: + unlock_page(push_page); + if (i != page->index) + page_cache_release(push_page); + } + + if (!sparse) + squashfs_cache_put(buffer); +#ifdef CONFIG_SQUASHFS_MPCORE + page_cache_release(page); +#endif + + return 0; + +error_out: + SetPageError(page); +out: + pageaddr = kmap_atomic(page); + memset(pageaddr, 0, PAGE_CACHE_SIZE); + kunmap_atomic(pageaddr); + flush_dcache_page(page); + if (!PageError(page)) + SetPageUptodate(page); + unlock_page(page); + + return 0; +} + +/* + * readpages implementation and Multi Core implementation + * for squashfs + * + */ +static int squashfs_readpages(struct file *filp, struct address_space *mapping, + struct list_head *pages, unsigned nr_pages) +{ + unsigned page_idx; + + +#ifdef CONFIG_SQUASHFS_MPCORE + unsigned first_page_idx; + int err; + unsigned long index = 0; + struct squashfs_sb_info *msblk = filp->f_path.dentry->d_inode->i_sb->s_fs_info; + unsigned int pages_per_block; + + pages_per_block = (msblk->block_size/(PAGE_CACHE_SIZE)); + +#ifdef DEBUG + printk(KERN_EMERG"[%d]%s %d %d Ino %lu \n", current->pid, __FUNCTION__, nr_pages, pages_per_block, filp->f_path.dentry->d_inode->i_ino); +#endif + + if (nr_pages > pages_per_block) { + + /*Here we will grab the page and put into queue */ + for (first_page_idx = 0, page_idx = 0; page_idx < nr_pages; ) { + + struct page *page = NULL; + + if (first_page_idx == page_idx) { + page = list_to_page(pages); + prefetchw(&page->flags); + list_del(&page->lru); + /* Add this page to page-cache */ + /*err = add_to_page_cache_lru(page, mapping, page->index, GFP_KERNEL);*/ + err = add_to_page_cache(page, mapping, page->index, GFP_KERNEL); + if (unlikely(err)) { + /*printk(KERN_EMERG "releasing page cache \n");*/ + page_cache_release(page); + page_idx += 1; + first_page_idx = page_idx; + continue; + } + page_idx += pages_per_block; + index = page->index; + if (queue_put(to_reader_1, filp, page)) + break; + } else { + + page = grab_cache_page_nowait(mapping, (index + page_idx)); + if (unlikely(!page)) { + /*Need to do error checking here*/ + page_idx += 1; + continue; + /*return -ENOMEM;*/ + } else { + page_idx += pages_per_block; + queue_put(to_reader_1, filp, page); + } + + } + + } + + work_on_queue(to_reader_1); + } else + +#endif /* CONFIG_SQUASHFS_MPCORE */ + { + /* readpages Implementation */ + for (page_idx = 0; page_idx < nr_pages; page_idx++) { + struct page *page = list_to_page(pages); + prefetchw(&page->flags); + list_del(&page->lru); + /*if (!add_to_page_cache_lru(page, mapping, page->index, GFP_KERNEL)) {*/ + if (!add_to_page_cache(page, mapping, page->index, GFP_KERNEL)) { + squashfs_readpage(filp, page); + } + page_cache_release(page); + } + } + + + /*always return 0 as readpages either writes to a page or release it*/ + return 0; +} +#endif const struct address_space_operations squashfs_aops = { +#ifdef CONFIG_SQUASHFS_READPAGES_ENABLE + .readpages = squashfs_readpages, +#endif .readpage = squashfs_readpage }; diff --git a/fs/squashfs/lzo_wrapper.c b/fs/squashfs/lzo_wrapper.c index 00f4dfc..4bcdf64 100644 --- a/fs/squashfs/lzo_wrapper.c +++ b/fs/squashfs/lzo_wrapper.c @@ -37,7 +37,114 @@ struct squashfs_lzo { void *output; }; -static void *lzo_init(struct squashfs_sb_info *msblk, void *buff, int len) +#ifdef CONFIG_SQUASHFS_MPCORE +static void *lzo_init(struct squashfs_sb_info *msblk) +{ + unsigned int i = 0; + int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); + unsigned int processors = num_online_cpus(); + + /* Initialization of the lzo streams */ + struct squashfs_lzo *stream = kmalloc(processors * sizeof(stream), GFP_KERNEL); + if (NULL == stream) { + ERROR("Failed to allocate zlib stream\n"); + goto failed; + } + for_each_online_cpu(i) { + stream[i].input = vmalloc(block_size); + if (stream[i].input == NULL) + goto failed; + stream[i].output = vmalloc(block_size); + if (stream[i].output == NULL) + goto failed; + } + return stream; + +failed: + ERROR("Failed to allocate lzo workspace\n"); + i = 0; + for_each_online_cpu(i) { + if (stream[i].input) + vfree(stream[i].input); + } + if (stream) + kfree(stream); + return NULL; +} + + +static void lzo_free(void *strm) +{ + unsigned int i = 0; + struct squashfs_lzo *stream = strm; + + if (stream) { + for_each_online_cpu(i) { + if (stream[i].input) + vfree(stream[i].input); + if (stream[i].output) + vfree(stream[i].output); + } + kfree(stream); + } + strm = NULL; +} + +static int lzo_uncompress(struct squashfs_sb_info *msblk, void **buffer, + struct buffer_head **bh, int b, int offset, int length, int srclength, + int pages) +{ + unsigned int pid = smp_processor_id(); + struct squashfs_lzo *stream = msblk->stream; + void *buff = stream[pid].input; + int avail, i, bytes = length, res; + size_t out_len = srclength; + + mutex_lock(&msblk->read_data_mutex[pid]); + + for (i = 0; i < b; i++) { + wait_on_buffer(bh[i]); + if (!buffer_uptodate(bh[i])) + goto block_release; + + avail = min(bytes, msblk->devblksize - offset); + memcpy(buff, bh[i]->b_data + offset, avail); + buff += avail; + bytes -= avail; + offset = 0; + put_bh(bh[i]); + } + + res = lzo1x_decompress_safe(stream[pid].input, (size_t)length, + stream[pid].output, &out_len); + if (res != LZO_E_OK) + goto failed; + + res = bytes = (int)out_len; + for (i = 0, buff = stream[pid].output; bytes && i < pages; i++) { + avail = min_t(int, bytes, PAGE_CACHE_SIZE); + memcpy(buffer[i], buff, avail); + buff += avail; + bytes -= avail; + } + + mutex_unlock(&msblk->read_data_mutex[pid]); + return res; + +block_release: + for (; i < b; i++) + put_bh(bh[i]); + +failed: + mutex_unlock(&msblk->read_data_mutex[pid]); + + ERROR("lzo decompression failed, data probably corrupt\n"); + return -EIO; +} + +#else /* MPCORE*/ + +static void *lzo_init(struct squashfs_sb_info *msblk) { int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); @@ -58,7 +165,7 @@ failed2: failed: ERROR("Failed to allocate lzo workspace\n"); kfree(stream); - return ERR_PTR(-ENOMEM); + return NULL; } @@ -125,6 +232,8 @@ failed: return -EIO; } +#endif /*MPCORE*/ + const struct squashfs_decompressor squashfs_lzo_comp_ops = { .init = lzo_init, .free = lzo_free, diff --git a/fs/squashfs/squashfs_fs_sb.h b/fs/squashfs/squashfs_fs_sb.h index 52934a2..bd39cd5 100644 --- a/fs/squashfs/squashfs_fs_sb.h +++ b/fs/squashfs/squashfs_fs_sb.h @@ -63,7 +63,11 @@ struct squashfs_sb_info { __le64 *id_table; __le64 *fragment_index; __le64 *xattr_id_table; - struct mutex read_data_mutex; +#ifdef CONFIG_SQUASHFS_MPCORE + struct mutex *read_data_mutex; +#else + struct mutex read_data_mutex; +#endif /*MPCORE*/ struct mutex meta_index_mutex; struct meta_index *meta_index; void *stream; diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c index 260e392..2484a67 100644 --- a/fs/squashfs/super.c +++ b/fs/squashfs/super.c @@ -25,6 +25,8 @@ * This file implements code to read the superblock, read and initialise * in-memory structures at mount time, and all the VFS glue code to register * the filesystem. + * manish.s2 : added support for multicore + * : Added generic decompression selection with multicore */ #include <linux/fs.h> @@ -43,6 +45,9 @@ #include "squashfs.h" #include "decompressor.h" #include "xattr.h" +#ifdef CONFIG_SQUASHFS_MPCORE +#include "tegra_mp.h" +#endif static struct file_system_type squashfs_fs_type; static const struct super_operations squashfs_super_ops; @@ -85,7 +90,10 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent) unsigned int fragments; u64 lookup_table_start, xattr_id_table_start, next_table; int err; - +#ifdef CONFIG_SQUASHFS_MPCORE + unsigned int i = 0; + unsigned int processors = num_online_cpus(); +#endif TRACE("Entered squashfs_fill_superblock\n"); sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL); @@ -98,7 +106,20 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent) msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); msblk->devblksize_log2 = ffz(~msblk->devblksize); +#ifdef CONFIG_SQUASHFS_MPCORE + /* Initialization of mutex for each core */ + i = 0; + msblk->read_data_mutex = kmalloc((processors)*sizeof(struct mutex), GFP_KERNEL); + if (NULL == msblk->read_data_mutex) { + ERROR("unable to allocate Mutex Mem \n"); + goto failed_mount; + } + for_each_online_cpu(i) { + mutex_init(&msblk->read_data_mutex[i]); + } +#else /*MPCORE */ mutex_init(&msblk->read_data_mutex); +#endif /*MPCORE */ mutex_init(&msblk->meta_index_mutex); /* @@ -205,13 +226,21 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent) if (msblk->block_cache == NULL) goto failed_mount; +#ifdef CONFIG_SQUASHFS_MPCORE + /* Allocate read_page block */ + msblk->read_page = squashfs_cache_init("data", processors, (msblk->block_size)); + if (msblk->read_page == NULL) { + ERROR("Failed to allocate read_page block\n"); + goto failed_mount; + } +#else /* Allocate read_page block */ msblk->read_page = squashfs_cache_init("data", 1, msblk->block_size); if (msblk->read_page == NULL) { ERROR("Failed to allocate read_page block\n"); goto failed_mount; } - +#endif msblk->stream = squashfs_decompressor_init(sb, flags); if (IS_ERR(msblk->stream)) { err = PTR_ERR(msblk->stream); @@ -446,7 +475,26 @@ static int __init init_squashfs_fs(void) destroy_inodecache(); return err; } - +#ifdef CONFIG_SQUASHFS_MPCORE +/*M.S the size of different cache */ +/*fragment_buffer_size = msblk->block_size; +data_buffer_size = msblk->block_size; +metadata_buffer_size = SQUASHFS_METADATA_SIZE; +queue_buffer_size = data_buffer_size; +pages_per_block = (msblk->block_size/(PAGE_CACHE_SIZE));*/ +/* +* queue_buffer_size = fragment_buffer_size + data_buffer_size + metadata_buffer_size; +* M.S :- As of now we don't need that much big size of queue +* 1. we are currently working on offsets equal to number of pages in the block size +* so we will take the size of the queue equal to data_buffer_size only +* 2. The metadata requests are same as previous no threading. +* 3. We reduced the queue size further to 64 +* As of now max queue request will not be more than 64. +*/ +/* M.S Adding Threads here */ +initialise_threads(SQFS_QBUFFER_SIZE); + +#endif printk(KERN_INFO "squashfs: version 4.0 (2009/01/31) " "Phillip Lougher\n"); @@ -456,6 +504,11 @@ static int __init init_squashfs_fs(void) static void __exit exit_squashfs_fs(void) { +#ifdef CONFIG_SQUASHFS_MPCORE + printk(KERN_INFO"%s \n", __FUNCTION__); + /*MS Adding the exiting code */ + exit_threads(); +#endif unregister_filesystem(&squashfs_fs_type); destroy_inodecache(); } diff --git a/fs/squashfs/tegra_mp.c b/fs/squashfs/tegra_mp.c new file mode 100644 index 0000000..1d7e03f --- /dev/null +++ b/fs/squashfs/tegra_mp.c @@ -0,0 +1,368 @@ +/** +* @file: tegra_mp.c +* @brief: Multi Core support for squashFS +* Copyright: Copyright(C) Samsung India Pvt. Ltd 2011. All Rights Reserved. +* @author: SISC: manish.s2 +* @date: 2011/03/10 +* @History: +* v1.1a is stable & support dual core. +* v1.2 added multi core support. +* v1.8 Fix the bug for the queue fill ptr overrun +*/ + +#include <linux/delay.h> +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/cpumask.h> +#include <linux/cpu.h> +#include <linux/slab.h> + +#include "squashfs_fs_i.h" +#include "squashfs.h" +#include "tegra_mp.h" + + +struct squashfs_queue *to_reader_1; +static struct task_struct **thread; + +extern int read_this_page(struct file *file, struct page *page); + +int queue_fini(struct squashfs_queue *queue) +{ + + if (queue == NULL) { + printk(KERN_INFO "ERROR: Wrong queue ptr\n"); + return -EFAULT; + } + + + if (NULL != queue->data) { + kfree(queue->data); + queue->data = NULL; + } + + if (NULL != queue->cpu) { + kfree(queue->cpu); + queue = NULL; + } + if (NULL != queue) { + kfree(queue); + queue = NULL; + } + + return 0; +} + +struct squashfs_queue *queue_init(int size) +{ + + unsigned int i = 0; + int processors; + struct squashfs_queue *queue = NULL; + +#ifdef DEBUG + printk(KERN_INFO "[%s] size %d \n", __FUNCTION__, size + 1); +#endif + + processors = num_online_cpus(); + + queue = (struct squashfs_queue *)kmalloc(sizeof(struct squashfs_queue), GFP_KERNEL); + if (queue == NULL) { + printk(KERN_INFO "Out of memory in queue_init\n"); + return NULL; + } + + queue->data = (struct squashfs_qdata *)kmalloc((sizeof(struct squashfs_qdata) * (size + 1)), GFP_KERNEL); + if (NULL == queue->data) { + printk(KERN_INFO "unable to get the memory \n"); + queue_fini(queue); + return NULL; + } + + queue->cpu = kmalloc(processors * (sizeof(int)), GFP_KERNEL); + if (NULL == queue->cpu) { + printk(KERN_INFO "unable to get the memory for cpu \n"); + queue_fini(queue); + return NULL; + } + + + for_each_online_cpu(i) { + queue->cpu[i] = 0; + } + + queue->size = size + 1; + queue->readp = queue->writep = 0; + queue->empty = 1; + queue->full = 0; + queue->stop = 0; + init_waitqueue_head(&queue->wait_queue); + spin_lock_init(&queue->lock); + + return queue; +} + + +int queue_put(struct squashfs_queue *queue, void *filp, void *page) +{ + int processor_id = 0; + unsigned int i = 0; + spin_lock(&queue->lock); + + processor_id = raw_smp_processor_id(); + + if (((queue->writep + 1) % queue->size) == queue->readp) { +#ifdef DEBUG + printk(KERN_INFO "[%d] Queue is full: page %lu \n", current->pid, ((struct page *)page)->index); +#endif + queue->full = 1; + spin_unlock(&queue->lock); + + for_each_online_cpu(i) { + if (i != processor_id) { + queue->cpu[i] = 1; + } + + } + wake_up(&queue->wait_queue); + wait_event_timeout(queue->wait_queue, !queue->full, msecs_to_jiffies(100)); + spin_lock(&queue->lock); + if (((queue->writep + 1) % queue->size) == queue->readp) { +#ifdef DEBUG + printk(KERN_EMERG "[%d] Queue is still full: page %lu \n", current->pid, ((struct page *)page)->index); + printk(KERN_EMERG "[%d] Check threads \n", current->pid); +#endif + spin_unlock(&queue->lock); + return -1; + } + processor_id = raw_smp_processor_id(); + } + + queue->data[queue->writep].filp = filp; + queue->data[queue->writep].page = page; + queue->writep = ((queue->writep + 1) % queue->size); + queue->empty = 0; + +#ifdef DEBUG + printk(KERN_EMERG "[%d]queue put w%d:r%d page %lu \n", current->pid, queue->writep, queue->readp, ((struct page *)page)->index); +#endif + + for_each_online_cpu(i) { + if (i != processor_id) { + /*printk(KERN_INFO"waking up %d processor \n",i);*/ + queue->cpu[i] = 1; + } + + } + spin_unlock(&queue->lock); + wake_up(&queue->wait_queue); + return 0; +} + + +int queue_get(struct squashfs_queue *queue, int id, struct squashfs_qdata *data) +{ + /*struct squashfs_qdata *data;*/ + int processor_id = 0; +#ifdef DEBUG + printk(KERN_INFO "queue get %d \n", raw_smp_processor_id()); +#endif + spin_lock(&queue->lock); + processor_id = raw_smp_processor_id(); + + /* wait here if queue is empty */ + if (queue->readp == queue->writep) { + + if (1 == id) { + queue->empty = 1; + queue->full = 0; + spin_unlock(&queue->lock); + wake_up(&queue->wait_queue); + return -1; + } + +#ifdef DEBUG + printk(KERN_EMERG "[%d] Need to wait here as queue is empty \n", current->pid); +#endif + queue->empty = 1; + queue->full = 0; + queue->cpu[processor_id] = 0; + wake_up(&queue->wait_queue); + spin_unlock(&queue->lock); + wait_event_interruptible(queue->wait_queue, queue->cpu[processor_id]); + + /* After the thread gets out from wait queue */ + spin_lock(&queue->lock); + if (queue->stop || (queue->readp == queue->writep)) { + queue->empty = 1; + queue->full = 0; + wake_up(&queue->wait_queue); + spin_unlock(&queue->lock); +#ifdef DEBUG + printk(KERN_INFO " Thread%ld %s \n", current->cpus_allowed, (queue->stop ? "should stop" : "queue is empty")); +#endif + return -1; + } + } + + + data->filp = queue->data[queue->readp].filp; + data->page = queue->data[queue->readp].page; + queue->data[queue->readp].filp = NULL; + queue->data[queue->readp].page = NULL; + queue->readp = (queue->readp + 1) % queue->size; + queue->full = 0; +#ifdef DEBUG + printk(KERN_EMERG "[%d]queue get w%d:r%d page %lu \n", \ + current->pid, queue->writep, queue->readp, ((struct page *)data->page)->index); +#endif + spin_unlock(&queue->lock); + wake_up(&queue->wait_queue); + + + return 0; +} + + + +void squashfs_thread(void *arg) +{ + + struct squashfs_qdata data; + int ret = 0; + + set_user_nice(current, -20); + printk(KERN_INFO "### Started squashfs thread_%d \n", raw_smp_processor_id()); + while (!kthread_should_stop()) { + + + ret = queue_get(to_reader_1, 0, &data); + if (unlikely(0 > ret)) { + if (to_reader_1->stop) { + printk(KERN_INFO"ERROR : We are seeing the stop being set\n"); + break; + } else { + continue; + } + } else { +#ifdef DEBUG + /* Can remove this as its for error checking */ + if ((NULL != data.filp) && (NULL != data.page)) { + printk(KERN_INFO "here it is page index %ld \n", data.page->index); + read_this_page(data.filp, data.page); + } else { + printk(KERN_INFO"Ptr is NULL \n"); + } +#else + read_this_page(data.filp, data.page); +#endif + + + } + + } + printk(KERN_INFO"SquashFS Thread : I am dying!\n"); + +} + +void squashfs_process_data(void) +{ + + struct squashfs_qdata data; + int ret = 0; + + while (1) { + + + ret = queue_get(to_reader_1, 1, &data); + if (unlikely(0 > ret)) { +#ifdef DEBUG + printk(KERN_INFO "[%s][%d] Q is empty so we are exiting \n", __FUNCTION__, current->pid); +#endif + break; + } else { + read_this_page(data.filp, data.page); + } + + } + +} + +void work_on_queue(struct squashfs_queue *queue) +{ + squashfs_process_data(); +} + +int initialise_threads(int queue_buffer_size) +{ + unsigned int i = 0; + int processors; + + processors = num_online_cpus(); + +#ifdef DEBUG + printk(KERN_INFO "no of active cores %d \n", processors); +#endif + + /* Initialize the Queue */ + to_reader_1 = queue_init(queue_buffer_size); + + + if ((thread = kmalloc((NOTHR_THREADS + processors) * sizeof(struct task_struct *), GFP_KERNEL)) == NULL) { + printk(KERN_INFO "Out of memory allocating thread descriptors\n"); + return -ENOMEM; + } + + + /* Create Number n Number of Deflator threads same as core.*/ + for_each_online_cpu(i) { + printk(KERN_INFO "Created %d thread \n", i); + thread[NOTHR_THREADS + i] = kthread_create((void *)squashfs_thread, NULL, MODULE_NAME); + if (IS_ERR(thread[NOTHR_THREADS + i])) { + printk(KERN_ERR ": unable to start deflator kernel thread\n"); + return -ENOMEM; + } else { + printk(KERN_INFO" ################## \n"); + printk(KERN_INFO"Binding cpu %d \n", i); + kthread_bind(thread[NOTHR_THREADS + i], i); + wake_up_process(thread[NOTHR_THREADS + i]); + } + } + + + return 0; + +} + +void exit_threads() +{ + int i = 0; + + /* wake up both threads */ + to_reader_1->empty = 0; + to_reader_1->stop = 1; + for_each_online_cpu(i) { + to_reader_1->cpu[i] = 1; + } + wake_up_all(&to_reader_1->wait_queue); + +#if 0 + for (i = NOTHR_THREADS; i < (NOTHR_THREADS + NR_CPUS); i++) { + + if (NULL != thread[i]) + kthread_stop(thread[i]); + + } + if (thread) + kfree(thread); + +#endif + /* We have only one queue as of now */ + if (queue_fini(to_reader_1)) + printk(KERN_INFO"ERROR: In queue deallocation \n"); + + +} + diff --git a/fs/squashfs/tegra_mp.h b/fs/squashfs/tegra_mp.h new file mode 100644 index 0000000..ca60c56 --- /dev/null +++ b/fs/squashfs/tegra_mp.h @@ -0,0 +1,58 @@ +/** +* @file tegra_mp.h +* @brief Multi Core support for squashFS +* Copyright: Copyright(C) Samsung India Pvt. Ltd 2011. All Rights Reserved. +* @author SISC: manish.s2 +* @date 2011/03/10 +* @desc Added Multi core support in squashfs +*/ +#ifndef __MP_TEGRA__ +#define __MP_TEGRA__ + + +#include <linux/fs.h> +#include <linux/vfs.h> +#include <linux/wait.h> + +/* Total number of other threads except if needed */ +/*#define NOTHR_THREADS 3 // To be used if we additional threads or so.*/ +#define NOTHR_THREADS 0 +#define MODULE_NAME "tegra_mpcore" + +/* Max page pool size 64 and min squashfs block size 4k */ +#define SQFS_QBUFFER_SIZE (64) + +/*#define DEBUG*/ + +struct squashfs_qdata{ + struct file *filp; + struct page *page; + int index; +}; + + +/* struct describing queues used to pass data between threads */ +struct squashfs_queue { + int size; + int readp; + int writep; + wait_queue_head_t wait_queue; + spinlock_t lock; + + int empty; + int full; + int *cpu; + int stop; + struct squashfs_qdata *data; +}; + + +/* Functions */ +int initialise_threads(int queue_buffer_size); +void exit_threads(void); +int queue_put(struct squashfs_queue *queue, void *filp, void *page); +int queue_get(struct squashfs_queue *queue, int id, struct squashfs_qdata *data); +struct squashfs_queue *queue_init(int size); +void work_on_queue(struct squashfs_queue *queue); + +#endif /*__MP_TEGRA__*/ diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c index 55d918f..5e8b0a1 100644 --- a/fs/squashfs/zlib_wrapper.c +++ b/fs/squashfs/zlib_wrapper.c @@ -19,7 +19,13 @@ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * zlib_wrapper.c - */ + * manish.s2: added the dual core support for squashfs. + * : Seperate mutex & z_stream for each core. + * : generalized for multicores. + * : Added seperate mutex and zlib stream for Multicore. + * : Replace zlib_init with zlib_reset for performance. + * +*/ #include <linux/mutex.h> @@ -33,6 +39,156 @@ #include "squashfs.h" #include "decompressor.h" +#ifdef CONFIG_SQUASHFS_MPCORE +static void *zlib_init(struct squashfs_sb_info *dummy, void *buff, int len) +{ + unsigned int processors = num_online_cpus(); + unsigned int i = 0; + int zlib_err = 0; + + z_stream *stream = kmalloc((processors * sizeof(z_stream)), GFP_KERNEL); + if (stream == NULL) + goto failed; + + for_each_online_cpu(i) { + stream[i].workspace = kmalloc(zlib_inflate_workspacesize(), + GFP_KERNEL); + if (stream[i].workspace == NULL) + goto failed; + zlib_err = zlib_inflateInit(&(stream[i])); + if (zlib_err != Z_OK) { + ERROR("zlib_inflateInit returned unexpected " + "result 0x%x\n", + zlib_err); + goto failed; + } + } + return stream; + +failed: + ERROR("Failed to allocate zlib workspace\n"); + i = 0; + for_each_online_cpu(i) { + if (stream[i].workspace) + kfree(stream[i].workspace); + } + if (stream) + kfree(stream); + return NULL; +} + + +static void zlib_free(void *strm) +{ + z_stream *stream = strm; + unsigned int i = 0; + + for_each_online_cpu(i) { + if (stream[i].workspace) + kfree(stream[i].workspace); + } + if (stream) + kfree(stream); + strm = NULL; +} + + +static int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer, + struct buffer_head **bh, int b, int offset, int length, int srclength, + int pages) +{ + int zlib_err = 0; + int avail, bytes, k = 0, page = 0; + unsigned int pid = smp_processor_id(); + z_stream *stream = msblk->stream; + + mutex_lock(&msblk->read_data_mutex[pid]); + /*printk(KERN_INFO "[%s] pid %d \n",__FUNCTION__,pid);*/ + /* + * We are resetting zlib stream here so that it avoids the + * overhead of zlib_init again and again for each + * request. + */ + zlib_err = zlib_inflateReset(&(stream[pid])); + if (zlib_err != Z_OK) { + ERROR("zlib_Reset returned %d \n", zlib_err); + printk(KERN_EMERG"zlib_Reset returned %d \n", zlib_err); + goto release_mutex; + } + + stream[pid].avail_out = 0; + stream[pid].avail_in = 0; + + bytes = length; + do { + if (stream[pid].avail_in == 0 && k < b) { + avail = min(bytes, msblk->devblksize - offset); + bytes -= avail; + wait_on_buffer(bh[k]); + if (!buffer_uptodate(bh[k])) + goto release_mutex; + + if (avail == 0) { + offset = 0; + put_bh(bh[k++]); + continue; + } + + stream[pid].next_in = bh[k]->b_data + offset; + stream[pid].avail_in = avail; + offset = 0; + } + + if (stream[pid].avail_out == 0 && page < pages) { + stream[pid].next_out = buffer[page++]; + stream[pid].avail_out = PAGE_CACHE_SIZE; + } +#if 0 + if (!zlib_init) { + zlib_err = zlib_inflateInit(&(stream[pid])); + if (zlib_err != Z_OK) { + ERROR("zlib_inflateInit returned unexpected " + "result 0x%x, srclength %d\n", + zlib_err, srclength); + goto release_mutex; + } + zlib_init = 1; + } +#endif + + zlib_err = zlib_inflate(&(stream[pid]), Z_SYNC_FLUSH); + + if (stream[pid].avail_in == 0 && k < b) + put_bh(bh[k++]); + } while (zlib_err == Z_OK); + + if (zlib_err != Z_STREAM_END) { + ERROR("zlib_inflate error, data probably corrupt %d \n", zlib_err); + printk(KERN_INFO"avail in %d avail out %d \n", stream[pid].avail_in, stream[pid].avail_out); + goto release_mutex; + } +#if 0 + zlib_err = zlib_inflateEnd(&(stream[pid])); + if (zlib_err != Z_OK) { + ERROR("zlib_inflate error, data probably corrupt\n"); + goto release_mutex; + } +#endif + length = stream[pid].total_out; + mutex_unlock(&msblk->read_data_mutex[pid]); + return length; + +release_mutex: + mutex_unlock(&msblk->read_data_mutex[pid]); + + for (; k < b; k++) + put_bh(bh[k]); + + return -EIO; +} + +#else /* MPCORE*/ + static void *zlib_init(struct squashfs_sb_info *dummy, void *buff, int len) { z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL); @@ -137,7 +293,7 @@ release_mutex: return -EIO; } - +#endif /* MPCORE*/ const struct squashfs_decompressor squashfs_zlib_comp_ops = { .init = zlib_init, .free = zlib_free, -- 1.7.9.5