aboutsummaryrefslogtreecommitdiff
path: root/fs
diff options
context:
space:
mode:
authorNick Piggin <npiggin@suse.de>2008-01-30 13:31:20 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:31:20 +0100
commit95c354fe9f7d6decc08a92aa26eb233ecc2155bf (patch)
treeec9267032ea875e84216cfb20acb2cfc7c62149f /fs
parenta95d67f87e1a5f1b4429be3ba3bf7b4051657908 (diff)
downloadlinux-95c354fe9f7d6decc08a92aa26eb233ecc2155bf.tar.gz
spinlock: lockbreak cleanup
The break_lock data structure and code for spinlocks is quite nasty. Not only does it double the size of a spinlock but it changes locking to a potentially less optimal trylock. Put all of that under CONFIG_GENERIC_LOCKBREAK, and introduce a __raw_spin_is_contended that uses the lock data itself to determine whether there are waiters on the lock, to be used if CONFIG_GENERIC_LOCKBREAK is not set. Rename need_lockbreak to spin_needbreak, make it use spin_is_contended to decouple it from the spinlock implementation, and make it typesafe (rwlocks do not have any need_lockbreak sites -- why do they even get bloated up with that break_lock then?). Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'fs')
-rw-r--r--fs/jbd/checkpoint.c3
-rw-r--r--fs/jbd/commit.c2
-rw-r--r--fs/jbd2/checkpoint.c3
-rw-r--r--fs/jbd2/commit.c2
4 files changed, 6 insertions, 4 deletions
diff --git a/fs/jbd/checkpoint.c b/fs/jbd/checkpoint.c
index 0f69c416eeb..a5432bbbfb8 100644
--- a/fs/jbd/checkpoint.c
+++ b/fs/jbd/checkpoint.c
@@ -347,7 +347,8 @@ restart:
break;
}
retry = __process_buffer(journal, jh, bhs,&batch_count);
- if (!retry && lock_need_resched(&journal->j_list_lock)){
+ if (!retry && (need_resched() ||
+ spin_needbreak(&journal->j_list_lock))) {
spin_unlock(&journal->j_list_lock);
retry = 1;
break;
diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index 610264b99a8..31853eb65b4 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -265,7 +265,7 @@ write_out_data:
put_bh(bh);
}
- if (lock_need_resched(&journal->j_list_lock)) {
+ if (need_resched() || spin_needbreak(&journal->j_list_lock)) {
spin_unlock(&journal->j_list_lock);
goto write_out_data;
}
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 1b7f282c1ae..6914598022c 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -353,7 +353,8 @@ restart:
}
retry = __process_buffer(journal, jh, bhs, &batch_count,
transaction);
- if (!retry && lock_need_resched(&journal->j_list_lock)){
+ if (!retry && (need_resched() ||
+ spin_needbreak(&journal->j_list_lock))) {
spin_unlock(&journal->j_list_lock);
retry = 1;
break;
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index da8d0eb3b7b..4f302d27927 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -341,7 +341,7 @@ write_out_data:
put_bh(bh);
}
- if (lock_need_resched(&journal->j_list_lock)) {
+ if (need_resched() || spin_needbreak(&journal->j_list_lock)) {
spin_unlock(&journal->j_list_lock);
goto write_out_data;
}