From: Sergei Trofimovich <sly...@gentoo.org>
Changing 'mount -oremount,thread_pool=2 /' didn't make any effect:
maximum amount of worker threads is specified in 2 places:
- in 'strict btrfs_fs_info::thread_pool_size'
- in each worker struct: 'struct btrfs_workers::max_workers'
'mount -oremount' updated only 'btrfs_fs_info::thread_pool_size'.
Fix it by pushing new maximum value to all created worker structures
as well.
Cc: Josef Bacik <jo...@redhat.com>
Cc: Chris Mason <chris.ma...@oracle.com>
Signed-off-by: Sergei Trofimovich <sly...@gentoo.org>
---
WARNING: This patch makes sense only with
WARNING: "btrfs: fix early abort in 'remount'"
WARNING: sitting in Josef's -next branch.
fs/btrfs/super.c | 38 +++++++++++++++++++++++++++++++++-----
1 files changed, 33 insertions(+), 5 deletions(-)
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2f28fc0..ed2dab9 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -435,11 +435,8 @@ int btrfs_parse_options(struct btrfs_root *root, char
*options)
case Opt_thread_pool:
intarg = 0;
match_int(&args[0], &intarg);
- if (intarg) {
+ if (intarg)
info->thread_pool_size = intarg;
- printk(KERN_INFO "btrfs: thread pool %d\n",
- info->thread_pool_size);
- }
break;
case Opt_max_inline:
num = match_strdup(&args[0]);
@@ -1119,6 +1116,35 @@ error_fs_info:
return ERR_PTR(error);
}
+static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit)
+{
+ workers->max_workers = new_limit;
+}
+
+static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, int
new_pool_size, int old_pool_size)
+{
+ if (new_pool_size != old_pool_size) {
+ fs_info->thread_pool_size = new_pool_size;
+
+ printk(KERN_INFO "btrfs: resize thread pool %d -> %d\n",
old_pool_size, new_pool_size);
+
+ btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size);
+ btrfs_set_max_workers(&fs_info->workers, new_pool_size);
+ btrfs_set_max_workers(&fs_info->delalloc_workers,
new_pool_size);
+ btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size);
+ btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size);
+ btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size);
+ btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size);
+ btrfs_set_max_workers(&fs_info->endio_meta_workers,
new_pool_size);
+ btrfs_set_max_workers(&fs_info->endio_meta_write_workers,
new_pool_size);
+ btrfs_set_max_workers(&fs_info->endio_write_workers,
new_pool_size);
+ btrfs_set_max_workers(&fs_info->endio_freespace_worker,
new_pool_size);
+ btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size);
+ btrfs_set_max_workers(&fs_info->readahead_workers,
new_pool_size);
+ btrfs_set_max_workers(&fs_info->scrub_workers, new_pool_size);
+ }
+}
+
static int btrfs_remount(struct super_block *sb, int *flags, char *data)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
@@ -1138,6 +1164,8 @@ static int btrfs_remount(struct super_block *sb, int
*flags, char *data)
goto restore;
}
+ btrfs_resize_thread_pool(fs_info, fs_info->thread_pool_size,
old_thread_pool_size);
+
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
return 0;
@@ -1181,7 +1209,7 @@ restore:
fs_info->compress_type = old_compress_type;
fs_info->max_inline = old_max_inline;
fs_info->alloc_start = old_alloc_start;
- fs_info->thread_pool_size = old_thread_pool_size;
+ btrfs_resize_thread_pool(fs_info, old_thread_pool_size,
fs_info->thread_pool_size);
fs_info->metadata_ratio = old_metadata_ratio;
return ret;
}
--
1.7.8.5
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