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| author | Chris Metcalf <cmetcalf@ezchip.com> | 2015-03-30 23:33:00 +0300 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@ezchip.com> | 2015-04-17 21:01:41 +0300 |
| commit | 128f3cb9398b5eeb4ee04b60bd5e314f5c122821 (patch) | |
| tree | a9cb1e04a11883d1ad9587779155cdd82d67958f /arch/tile/include | |
| parent | 437d3e124d25daaa671bfecfd4015ecd2503a955 (diff) | |
| download | linux-128f3cb9398b5eeb4ee04b60bd5e314f5c122821.tar.xz | |
tile: nohz: warn if nohz_full uses hypervisor shared cores
The "hypervisor shared" cores are ones that the Tilera hypervisor
uses to receive interrupts to manage hypervisor-owned devices.
It's a bad idea to try to use those cores with nohz_full, since
they will get interrupted unpredictably -- and invisibly to Linux
tracing tools, since the interrupts are delivered at a higher
privilege level to the Tilera hypervisor.
Generate a clear warning at boot up that this doesn't end well
for the nohz_full cores in question.
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Diffstat (limited to 'arch/tile/include')
| -rw-r--r-- | arch/tile/include/hv/hypervisor.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/tile/include/hv/hypervisor.h b/arch/tile/include/hv/hypervisor.h index dfcdeb61ba34..e0e6af4e783b 100644 --- a/arch/tile/include/hv/hypervisor.h +++ b/arch/tile/include/hv/hypervisor.h @@ -961,7 +961,11 @@ typedef enum { HV_INQ_TILES_HFH_CACHE = 2, /** The set of tiles that can be legally used as a LOTAR for a PTE. */ - HV_INQ_TILES_LOTAR = 3 + HV_INQ_TILES_LOTAR = 3, + + /** The set of "shared" driver tiles that the hypervisor may + * periodically interrupt. */ + HV_INQ_TILES_SHARED = 4 } HV_InqTileSet; /** Returns specific information about various sets of tiles within the |