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authorTheodore Ts'o <tytso@mit.edu>2008-11-05 00:09:22 -0500
committerTheodore Ts'o <tytso@mit.edu>2008-11-05 00:09:22 -0500
commit1a0d3786dd57dbd74f340322054c3d618b999dcf (patch)
treeb10b3ed6cb60ee34a4e8140e60da2ecc34b52f32 /include/linux/jbd2.h
parent498e5f24158da7bf8fa48074a70e370e22844492 (diff)
downloadblackbird-op-linux-1a0d3786dd57dbd74f340322054c3d618b999dcf.tar.gz
blackbird-op-linux-1a0d3786dd57dbd74f340322054c3d618b999dcf.zip
jbd2: Remove a large array of bh's from the stack of the checkpoint routine
jbd2_log_do_checkpoint()n is one of the kernel's largest stack users. Move the array of buffer head's from the stack of jbd2_log_do_checkpoint() to the in-core journal structure. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'include/linux/jbd2.h')
-rw-r--r--include/linux/jbd2.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index a3cd647ea1bc..004c9a8d63ed 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -687,6 +687,8 @@ jbd2_time_diff(unsigned long start, unsigned long end)
return end + (MAX_JIFFY_OFFSET - start);
}
+#define JBD2_NR_BATCH 64
+
/**
* struct journal_s - The journal_s type is the concrete type associated with
* journal_t.
@@ -831,6 +833,14 @@ struct journal_s
struct mutex j_checkpoint_mutex;
/*
+ * List of buffer heads used by the checkpoint routine. This
+ * was moved from jbd2_log_do_checkpoint() to reduce stack
+ * usage. Access to this array is controlled by the
+ * j_checkpoint_mutex. [j_checkpoint_mutex]
+ */
+ struct buffer_head *j_chkpt_bhs[JBD2_NR_BATCH];
+
+ /*
* Journal head: identifies the first unused block in the journal.
* [j_state_lock]
*/
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