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author | Theodore Ts'o <tytso@mit.edu> | 2008-11-05 08:09:22 +0300 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2008-11-05 08:09:22 +0300 |
commit | 1a0d3786dd57dbd74f340322054c3d618b999dcf (patch) | |
tree | b10b3ed6cb60ee34a4e8140e60da2ecc34b52f32 /include/linux/jbd2.h | |
parent | 498e5f24158da7bf8fa48074a70e370e22844492 (diff) | |
download | linux-1a0d3786dd57dbd74f340322054c3d618b999dcf.tar.xz |
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.h | 10 |
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] */ |