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Date: Wed, 18 Nov 2020 07:39:32 -0800
From: Saranya Muruganandam <saranyamohan@...gle.com>
To: linux-ext4@...r.kernel.org, tytso@....edu
Cc: adilger.kernel@...ger.ca, Wang Shilong <wshilong@....com>,
Saranya Muruganandam <saranyamohan@...gle.com>
Subject: [RFC PATCH v3 46/61] ext2fs: parallel bitmap loading
From: Wang Shilong <wshilong@....com>
In our benchmarking for PiB size filesystem, pass5 takes
10446s to finish and 99.5% of time takes on reading bitmaps.
It makes sense to reading bitmaps using multiple threads,
a quickly benchmark show 10446s to 626s with 64 threads.
Signed-off-by: Wang Shilong <wshilong@....com>
Signed-off-by: Saranya Muruganandam <saranyamohan@...gle.com>
---
lib/ext2fs/rw_bitmaps.c | 289 ++++++++++++++++++++++++++++++++++------
1 file changed, 250 insertions(+), 39 deletions(-)
diff --git a/lib/ext2fs/rw_bitmaps.c b/lib/ext2fs/rw_bitmaps.c
index d80c9eb8..960a6913 100644
--- a/lib/ext2fs/rw_bitmaps.c
+++ b/lib/ext2fs/rw_bitmaps.c
@@ -23,6 +23,7 @@
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
+#include <pthread.h>
#include "ext2_fs.h"
#include "ext2fs.h"
@@ -205,22 +206,12 @@ static int bitmap_tail_verify(unsigned char *bitmap, int first, int last)
return 1;
}
-static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
+static errcode_t read_bitmaps_range_prepare(ext2_filsys fs, int do_inode, int do_block)
{
- dgrp_t i;
- char *block_bitmap = 0, *inode_bitmap = 0;
- char *buf;
errcode_t retval;
int block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
- int tail_flags = 0;
- int csum_flag;
- unsigned int cnt;
- blk64_t blk;
- blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
- blk64_t blk_cnt;
- ext2_ino_t ino_itr = 1;
- ext2_ino_t ino_cnt;
+ char *buf;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
@@ -230,11 +221,10 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
fs->write_bitmaps = ext2fs_write_bitmaps;
- csum_flag = ext2fs_has_group_desc_csum(fs);
-
retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
if (retval)
return retval;
+
if (do_block) {
if (fs->block_map)
ext2fs_free_block_bitmap(fs->block_map);
@@ -243,11 +233,8 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
if (retval)
goto cleanup;
- retval = io_channel_alloc_buf(fs->io, 0, &block_bitmap);
- if (retval)
- goto cleanup;
- } else
- block_nbytes = 0;
+ }
+
if (do_inode) {
if (fs->inode_map)
ext2fs_free_inode_bitmap(fs->inode_map);
@@ -256,13 +243,69 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
if (retval)
goto cleanup;
- retval = io_channel_alloc_buf(fs->io, 0, &inode_bitmap);
+ }
+ ext2fs_free_mem(&buf);
+
+ return retval;
+
+cleanup:
+ if (do_block) {
+ ext2fs_free_block_bitmap(fs->block_map);
+ fs->block_map = 0;
+ }
+ if (do_inode) {
+ ext2fs_free_inode_bitmap(fs->inode_map);
+ fs->inode_map = 0;
+ }
+ if (buf)
+ ext2fs_free_mem(&buf);
+ return retval;
+}
+
+static errcode_t read_bitmaps_range_start(ext2_filsys fs, int do_inode, int do_block,
+ dgrp_t start, dgrp_t end, pthread_mutex_t *mutex,
+ io_channel io)
+{
+ dgrp_t i;
+ char *block_bitmap = 0, *inode_bitmap = 0;
+ char *buf;
+ errcode_t retval;
+ int block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
+ int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
+ int tail_flags = 0;
+ int csum_flag;
+ unsigned int cnt;
+ blk64_t blk;
+ blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
+ blk64_t blk_cnt;
+ ext2_ino_t ino_itr = 1;
+ ext2_ino_t ino_cnt;
+ io_channel this_io;
+
+ if (!io)
+ this_io = fs->io;
+ else
+ this_io = io;
+
+ csum_flag = ext2fs_has_group_desc_csum(fs);
+
+ if (do_block) {
+ retval = io_channel_alloc_buf(this_io, 0, &block_bitmap);
+ if (retval)
+ goto cleanup;
+ } else {
+ block_nbytes = 0;
+ }
+
+ if (do_inode) {
+ retval = io_channel_alloc_buf(this_io, 0, &inode_bitmap);
if (retval)
goto cleanup;
- } else
+ } else {
inode_nbytes = 0;
- ext2fs_free_mem(&buf);
+ }
+ /* io should be null */
if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
blk = (ext2fs_le32_to_cpu(fs->image_header->offset_inodemap) / fs->blocksize);
ino_cnt = fs->super->s_inodes_count;
@@ -303,7 +346,9 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
goto success_cleanup;
}
- for (i = 0; i < fs->group_desc_count; i++) {
+ blk_itr += ((blk64_t)start * (block_nbytes << 3));
+ ino_itr += ((blk64_t)start * (inode_nbytes << 3));
+ for (i = start; i <= end; i++) {
if (block_bitmap) {
blk = ext2fs_block_bitmap_loc(fs, i);
if ((csum_flag &&
@@ -312,7 +357,7 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
(blk >= ext2fs_blocks_count(fs->super)))
blk = 0;
if (blk) {
- retval = io_channel_read_blk64(fs->io, blk,
+ retval = io_channel_read_blk64(this_io, blk,
1, block_bitmap);
if (retval) {
retval = EXT2_ET_BLOCK_BITMAP_READ;
@@ -333,8 +378,12 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
} else
memset(block_bitmap, 0, block_nbytes);
cnt = block_nbytes << 3;
+ if (mutex)
+ pthread_mutex_lock(mutex);
retval = ext2fs_set_block_bitmap_range2(fs->block_map,
blk_itr, cnt, block_bitmap);
+ if (mutex)
+ pthread_mutex_unlock(mutex);
if (retval)
goto cleanup;
blk_itr += block_nbytes << 3;
@@ -347,7 +396,7 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
(blk >= ext2fs_blocks_count(fs->super)))
blk = 0;
if (blk) {
- retval = io_channel_read_blk64(fs->io, blk,
+ retval = io_channel_read_blk64(this_io, blk,
1, inode_bitmap);
if (retval) {
retval = EXT2_ET_INODE_BITMAP_READ;
@@ -369,29 +418,28 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
} else
memset(inode_bitmap, 0, inode_nbytes);
cnt = inode_nbytes << 3;
+ if (mutex)
+ pthread_mutex_lock(mutex);
retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
ino_itr, cnt, inode_bitmap);
+ if (mutex)
+ pthread_mutex_unlock(mutex);
if (retval)
goto cleanup;
ino_itr += inode_nbytes << 3;
}
}
- /* Mark group blocks for any BLOCK_UNINIT groups */
- if (do_block) {
- retval = mark_uninit_bg_group_blocks(fs);
- if (retval)
- goto cleanup;
- }
-
success_cleanup:
- if (inode_bitmap) {
- ext2fs_free_mem(&inode_bitmap);
- fs->flags &= ~EXT2_FLAG_IBITMAP_TAIL_PROBLEM;
- }
- if (block_bitmap) {
- ext2fs_free_mem(&block_bitmap);
- fs->flags &= ~EXT2_FLAG_BBITMAP_TAIL_PROBLEM;
+ if (start == 0 && end == fs->group_desc_count - 1) {
+ if (inode_bitmap) {
+ ext2fs_free_mem(&inode_bitmap);
+ fs->flags &= ~EXT2_FLAG_IBITMAP_TAIL_PROBLEM;
+ }
+ if (block_bitmap) {
+ ext2fs_free_mem(&block_bitmap);
+ fs->flags &= ~EXT2_FLAG_BBITMAP_TAIL_PROBLEM;
+ }
}
fs->flags |= tail_flags;
return 0;
@@ -412,6 +460,169 @@ cleanup:
if (buf)
ext2fs_free_mem(&buf);
return retval;
+
+}
+
+static errcode_t read_bitmaps_range_end(ext2_filsys fs, int do_inode, int do_block)
+{
+ errcode_t retval = 0;
+
+ /* Mark group blocks for any BLOCK_UNINIT groups */
+ if (do_block) {
+ retval = mark_uninit_bg_group_blocks(fs);
+ if (retval)
+ goto cleanup;
+ }
+
+ return retval;
+cleanup:
+ if (do_block) {
+ ext2fs_free_block_bitmap(fs->block_map);
+ fs->block_map = 0;
+ }
+ if (do_inode) {
+ ext2fs_free_inode_bitmap(fs->inode_map);
+ fs->inode_map = 0;
+ }
+ return retval;
+}
+
+static errcode_t read_bitmaps_range(ext2_filsys fs, int do_inode, int do_block,
+ dgrp_t start, dgrp_t end)
+{
+ errcode_t retval;
+
+ retval = read_bitmaps_range_prepare(fs, do_inode, do_block);
+ if (retval)
+ return retval;
+
+ retval = read_bitmaps_range_start(fs, do_inode, do_block, start, end, NULL, NULL);
+ if (retval)
+ return retval;
+
+ return read_bitmaps_range_end(fs, do_inode, do_block);
+}
+
+#ifdef CONFIG_PFSCK
+struct read_bitmaps_thread_info {
+ ext2_filsys rbt_fs;
+ int rbt_do_inode;
+ int rbt_do_block;
+ dgrp_t rbt_grp_start;
+ dgrp_t rbt_grp_end;
+ errcode_t rbt_retval;
+ pthread_mutex_t *rbt_mutex;
+ io_channel rbt_io;
+};
+
+static void* read_bitmaps_thread(void *data)
+{
+ struct read_bitmaps_thread_info *rbt = data;
+
+ rbt->rbt_retval = read_bitmaps_range_start(rbt->rbt_fs,
+ rbt->rbt_do_inode, rbt->rbt_do_block,
+ rbt->rbt_grp_start, rbt->rbt_grp_end,
+ rbt->rbt_mutex, rbt->rbt_io);
+ return NULL;
+}
+#endif
+
+static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
+{
+#ifdef CONFIG_PFSCK
+ pthread_attr_t attr;
+ int num_threads = fs->fs_num_threads;
+ pthread_t *thread_ids = NULL;
+ struct read_bitmaps_thread_info *thread_infos = NULL;
+ pthread_mutex_t rbt_mutex = PTHREAD_MUTEX_INITIALIZER;
+ errcode_t retval;
+ errcode_t rc;
+ dgrp_t average_group;
+ int i;
+ io_manager manager = unix_io_manager;
+#else
+ int num_threads = 1;
+#endif
+
+ if (num_threads <= 1 || (fs->flags & EXT2_FLAG_IMAGE_FILE))
+ return read_bitmaps_range(fs, do_inode, do_block, 0, fs->group_desc_count - 1);
+
+#ifdef CONFIG_PFSCK
+ retval = pthread_attr_init(&attr);
+ if (retval)
+ return retval;
+
+ thread_ids = calloc(sizeof(pthread_t), num_threads);
+ if (!thread_ids)
+ return -ENOMEM;
+
+ thread_infos = calloc(sizeof(struct read_bitmaps_thread_info),
+ num_threads);
+ if (!thread_infos)
+ goto out;
+
+ average_group = ext2fs_get_avg_group(fs);
+ retval = read_bitmaps_range_prepare(fs, do_inode, do_block);
+ if (retval)
+ goto out;
+
+ fprintf(stdout, "Multiple threads triggered to read bitmaps\n");
+ for (i = 0; i < num_threads; i++) {
+ thread_infos[i].rbt_fs = fs;
+ thread_infos[i].rbt_do_inode = do_inode;
+ thread_infos[i].rbt_do_block = do_block;
+ thread_infos[i].rbt_mutex = &rbt_mutex;
+ if (i == 0)
+ thread_infos[i].rbt_grp_start = 0;
+ else
+ thread_infos[i].rbt_grp_start = average_group * i + 1;
+
+ if (i == num_threads - 1)
+ thread_infos[i].rbt_grp_end = fs->group_desc_count - 1;
+ else
+ thread_infos[i].rbt_grp_end = average_group * (i + 1);
+ retval = manager->open(fs->device_name, IO_FLAG_RW,
+ &thread_infos[i].rbt_io);
+ if (retval)
+ break;
+ io_channel_set_blksize(thread_infos[i].rbt_io, fs->io->block_size);
+ retval = pthread_create(&thread_ids[i], &attr,
+ &read_bitmaps_thread, &thread_infos[i]);
+ if (retval) {
+ io_channel_close(thread_infos[i].rbt_io);
+ break;
+ }
+ }
+ for (i = 0; i < num_threads; i++) {
+ if (!thread_ids[i])
+ break;
+ rc = pthread_join(thread_ids[i], NULL);
+ if (rc && !retval)
+ retval = rc;
+ rc = thread_infos[i].rbt_retval;
+ if (rc && !retval)
+ retval = rc;
+ io_channel_close(thread_infos[i].rbt_io);
+ }
+out:
+ rc = pthread_attr_destroy(&attr);
+ if (rc && !retval)
+ retval = rc;
+ free(thread_infos);
+ free(thread_ids);
+
+ if (!retval)
+ retval = read_bitmaps_range_end(fs, do_inode, do_block);
+
+ if (!retval) {
+ if (do_inode)
+ fs->flags &= ~EXT2_FLAG_IBITMAP_TAIL_PROBLEM;
+ if (do_block)
+ fs->flags &= ~EXT2_FLAG_BBITMAP_TAIL_PROBLEM;
+ }
+
+ return retval;
+#endif
}
errcode_t ext2fs_read_inode_bitmap(ext2_filsys fs)
--
2.29.2.299.gdc1121823c-goog
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