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From: Josef Bacik <josef@toxicpanda.com>
To: linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH 06/13] btrfs: add a mode for delayed ref time based throttling
Date: Fri, 13 Mar 2020 17:23:23 -0400	[thread overview]
Message-ID: <20200313212330.149024-7-josef@toxicpanda.com> (raw)
In-Reply-To: <20200313212330.149024-1-josef@toxicpanda.com>

Currently we only use btrfs_should_throttle_delayed_refs in the case
where we want to pre-emptively stop what we're doing and throttle
delayed refs in some way.  However we're going to use this function for
all transaction ending, so add a flag so we can toggle between the
maximum theoretical runtime and our "maybe we should start flushing"
runtime.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/delayed-ref.c | 9 +++++----
 fs/btrfs/delayed-ref.h | 3 ++-
 fs/btrfs/inode.c       | 3 ++-
 fs/btrfs/transaction.c | 2 +-
 4 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index e28565dc4288..6e9fa03be87d 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -50,7 +50,8 @@ bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info *fs_info)
 	return ret;
 }
 
-bool btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans)
+bool btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
+					bool for_throttle)
 {
 	u64 num_entries =
 		atomic_read(&trans->transaction->delayed_refs.num_entries);
@@ -62,9 +63,9 @@ bool btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans)
 	val = num_entries * avg_runtime;
 	if (val >= NSEC_PER_SEC)
 		return true;
-	if (val >= NSEC_PER_SEC / 2)
-		return true;
-	return false;
+	if (!for_throttle)
+		return false;
+	return (val >= NSEC_PER_SEC / 2);
 }
 
 /**
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 9a07480b497b..c0ae440434af 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -371,7 +371,8 @@ int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info,
 void btrfs_migrate_to_delayed_refs_rsv(struct btrfs_fs_info *fs_info,
 				       struct btrfs_block_rsv *src,
 				       u64 num_bytes);
-bool btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans);
+bool btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
+					bool for_throttle);
 bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info *fs_info);
 
 /*
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d3e75e04a0a0..ad0f0961a711 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4349,7 +4349,8 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 				break;
 			}
 			if (be_nice) {
-				if (btrfs_should_throttle_delayed_refs(trans) ||
+				if (btrfs_should_throttle_delayed_refs(trans,
+								       true) ||
 				    btrfs_check_space_for_delayed_refs(fs_info))
 					should_throttle = true;
 			}
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index f6eecb402f5b..b0d82e1a6a6e 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -865,7 +865,7 @@ int btrfs_should_end_transaction(struct btrfs_trans_handle *trans)
 	    cur_trans->delayed_refs.flushing)
 		return 1;
 
-	if (btrfs_should_throttle_delayed_refs(trans) ||
+	if (btrfs_should_throttle_delayed_refs(trans, true) ||
 	    btrfs_check_space_for_delayed_refs(fs_info))
 		return 1;
 
-- 
2.24.1


  parent reply	other threads:[~2020-03-13 21:23 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-13 21:23 [PATCH 00/13] Throttle delayed refs based on time Josef Bacik
2020-03-13 21:23 ` [PATCH 01/13] btrfs: use a stable rolling avg for delayed refs avg Josef Bacik
2020-03-13 21:23 ` [PATCH 02/13] btrfs: change btrfs_should_throttle_delayed_refs to a bool Josef Bacik
2020-03-13 21:23 ` [PATCH 03/13] btrfs: make btrfs_should_throttle_delayed_refs only check run time Josef Bacik
2020-03-13 21:23 ` [PATCH 04/13] btrfs: make should_end_transaction check time to run delayed refs Josef Bacik
2020-03-13 21:23 ` [PATCH 05/13] btrfs: squash should_end_transaction Josef Bacik
2020-03-13 21:23 ` Josef Bacik [this message]
2020-03-13 21:23 ` [PATCH 07/13] btrfs: kick off async delayed ref flushing if we are over time budget Josef Bacik
2020-04-09 13:11   ` Nikolay Borisov
2020-04-09 13:26   ` Nikolay Borisov
2020-03-13 21:23 ` [PATCH 08/13] btrfs: adjust the arguments for btrfs_should_throttle_delayed_refs Josef Bacik
2020-03-13 21:23 ` [PATCH 09/13] btrfs: throttle delayed refs based on time Josef Bacik
2020-03-13 21:23 ` [PATCH 10/13] btrfs: handle uncontrolled delayed ref generation Josef Bacik
2020-03-13 21:23 ` [PATCH 11/13] btrfs: check delayed refs while relocating Josef Bacik
2020-03-13 21:23 ` [PATCH 12/13] btrfs: throttle truncate for delayed ref generation Josef Bacik
2020-03-13 21:23 ` [PATCH 13/13] btrfs: throttle snapshot delete on delayed refs Josef Bacik

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