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authorJohn Harrison <John.C.Harrison@Intel.com>2015-10-26 12:22:22 +0000
committerJohn Harrison <John.C.Harrison@Intel.com>2016-06-30 15:06:30 +0100
commit4181518ed82820ef1d06dbf39ba4bd47a62b0587 (patch)
treedb6a80129f22f36dc3e3b174d759e491065edbab /net/rfkill/rfkill-gpio.c
parent32bb68c73dc8d42845a677a9cb4a8940e18057ee (diff)
drm/i915: Cache last IRQ seqno to reduce IRQ overheadfence
The notify function can be called many times without the seqno changing. Some are to prevent races due to the requirement of not enabling interrupts until requested. However, when interrupts are enabled the IRQ handler can be called multiple times without the ring's seqno value changing. E.g. two interrupts are generated by batch buffers completing in quick succession, the first call to the handler processes both completions but the handler still gets executed a second time. This patch reduces the overhead of these extra calls by caching the last processed seqno value and early exiting if it has not changed. v3: New patch for series. v5: Added comment about last_irq_seqno usage due to code review feedback (Tvrtko Ursulin). v6: Minor update to resolve a race condition with the wait_request optimisation. v7: Updated to newer nightly - lots of ring -> engine renaming plus an interface change to get_seqno(). v10: Renamed the cached variable as it is no longer used at IRQ time. [Review comment from Tvrtko Ursulin] For: VIZ-5190 Signed-off-by: John Harrison <John.C.Harrison@Intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Diffstat (limited to 'net/rfkill/rfkill-gpio.c')
0 files changed, 0 insertions, 0 deletions