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author | Yong Zhang <yong.zhang@windriver.com> | 2010-05-04 06:16:48 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2010-05-07 09:27:26 (GMT) |
commit | 4726f2a617ebd868a4fdeb5679613b897e5f1676 (patch) | |
tree | c9eea44c66f98123802d99aad5b3cce93626eda8 /arch/mips/kernel | |
parent | 54d47a2be5e7f928fb77b2f5a0761f6bd3c9dbff (diff) | |
download | linux-fsl-qoriq-4726f2a617ebd868a4fdeb5679613b897e5f1676.tar.xz |
lockdep: Reduce stack_trace usage
When calling check_prevs_add(), if all validations passed
add_lock_to_list() will add new lock to dependency tree and
alloc stack_trace for each list_entry.
But at this time, we are always on the same stack, so stack_trace
for each list_entry has the same value. This is redundant and eats
up lots of memory which could lead to warning on low
MAX_STACK_TRACE_ENTRIES.
Use one copy of stack_trace instead.
V2: As suggested by Peter Zijlstra, move save_trace() from
check_prevs_add() to check_prev_add().
Add tracking for trylock dependence which is also redundant.
Signed-off-by: Yong Zhang <yong.zhang0@windriver.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100504065711.GC10784@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/mips/kernel')
0 files changed, 0 insertions, 0 deletions