summaryrefslogtreecommitdiffstats
path: root/scripts/tracing
diff options
context:
space:
mode:
authorPaul Gortmaker <paul.gortmaker@windriver.com>2013-06-12 23:04:04 -0400
committerTheodore Ts'o <tytso@mit.edu>2013-06-12 23:04:04 -0400
commit169f1a2a87aae44034da4b9f81be1683d33de6d0 (patch)
treed6283b5c33699eaf22ea52c3298d38be0152059d /scripts/tracing
parentc9b3a8ccb77e063a28a9567eb72e0c1222c4ade4 (diff)
downloadop-kernel-dev-169f1a2a87aae44034da4b9f81be1683d33de6d0.zip
op-kernel-dev-169f1a2a87aae44034da4b9f81be1683d33de6d0.tar.gz
jbd2: use a single printk for jbd_debug()
Since the jbd_debug() is implemented with two separate printk() calls, it can lead to corrupted and misleading debug output like the following (see lines marked with "*"): [ 290.339362] (fs/jbd2/journal.c, 203): kjournald2: kjournald2 wakes [ 290.339365] (fs/jbd2/journal.c, 155): kjournald2: commit_sequence=42103, commit_request=42104 [ 290.339369] (fs/jbd2/journal.c, 158): kjournald2: OK, requests differ [* 290.339376] (fs/jbd2/journal.c, 648): jbd2_log_wait_commit: [* 290.339379] (fs/jbd2/commit.c, 370): jbd2_journal_commit_transaction: JBD2: want 42104, j_commit_sequence=42103 [* 290.339382] JBD2: starting commit of transaction 42104 [ 290.339410] (fs/jbd2/revoke.c, 566): jbd2_journal_write_revoke_records: Wrote 0 revoke records [ 290.376555] (fs/jbd2/commit.c, 1088): jbd2_journal_commit_transaction: JBD2: commit 42104 complete, head 42079 i.e. the debug output from log_wait_commit and journal_commit_transaction have become interleaved. The output should have been: (fs/jbd2/journal.c, 648): jbd2_log_wait_commit: JBD2: want 42104, j_commit_sequence=42103 (fs/jbd2/commit.c, 370): jbd2_journal_commit_transaction: JBD2: starting commit of transaction 42104 It is expected that this is not easy to replicate -- I was only able to cause it on preempt-rt kernels, and even then only under heavy I/O load. Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com> Suggested-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'scripts/tracing')
0 files changed, 0 insertions, 0 deletions
OpenPOWER on IntegriCloud