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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-11-19 11:09:45 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-11-27 09:24:18 +0100 |
| commit | 419123f900dac58fb27ce5285b21074f5300095a (patch) | |
| tree | d0b0d72691d4e2e3df0e9f4d2e335bebc378fdeb /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | c6f70d3b8a32fdec60d3f78cb59423f056f16688 (diff) | |
s390/spinlock: do not yield to a CPU in udelay/mdelay
It does not make sense to try to relinquish the time slice with diag 0x9c
to a CPU in a state that does not allow to schedule the CPU. The scenario
where this can happen is a CPU waiting in udelay/mdelay while holding a
spin-lock.
Add a CIF bit to tag a CPU in enabled wait and use it to detect that the
yield of a CPU will not be successful and skip the diagnose call.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions