Hi, Any updates on this patch series? On Thursday 18 September 2014 08:41 AM, Shreyas B Prabhu wrote: > Hi, > > In this patch series we use winkle for offlined cores. I successfully > tested the working of this with subcore functionality. > > Test scenario was as follows: > 1. Set SMT mode to 1, Set subores-per-core to 1 > 2. Offline a core, in this case cpu 32 (sending it to winkle) > 3. Set subcores-per-core to 4 > 4. Online the core > 5. Start a guest (Topology 1 core 2 threads) on a subcore, in this case > on cpu 36 > > This works without any glitch. > > Thanks, > Shreyas > > On Monday 25 August 2014 11:31 PM, Shreyas B. Prabhu wrote: >> Fast sleep is an idle state, where the core and the L1 and L2 >> caches are brought down to a threshold voltage. This also means that >> the communication between L2 and L3 caches have to be fenced. However >> the current P8 chips have a bug wherein this fencing between L2 and >> L3 caches get delayed by a cpu cycle. This can delay L3 response to >> the other cpus if they request for data during this time. Thus they >> would fetch the same data from the memory which could lead to data >> corruption if L3 cache is not flushed. >> Patch 4 adds support to work around this. >> >> 'Deep Winkle' is a deeper idle state where core and private L2 are powered >> off. While it offers higher power savings, it is at the cost of losing >> hypervisor register state and higher latency. >> Patch 5-9 adds support for winkle and uses it for offline cpus. >> >> Patch 1 - Moves parameters required discover idle states to a location >> common to both cpuidle driver and powernv core code >> Patch 2 - Populates idle state details from device tree >> Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle >> >> >> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> >> Cc: Paul Mackerras <paulus@xxxxxxxxx> >> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> >> Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> >> Cc: Srivatsa S. Bhat <srivatsa@xxxxxxx> >> Cc: Preeti U. Murthy <preeti@xxxxxxxxxxxxxxxxxx> >> Cc: Vaidyanathan Srinivasan <svaidy@xxxxxxxxxxxxxxxxxx> >> Cc: Rob Herring <robh+dt@xxxxxxxxxx> >> Cc: Grant Likely <grant.likely@xxxxxxxxxx> >> Cc: devicetree@xxxxxxxxxxxxxxx >> Cc: linux-pm@xxxxxxxxxxxxxxx >> Cc: linuxppc-dev@xxxxxxxxxxxxxxxx >> >> Preeti U Murthy (2): >> cpuidle/powernv: Populate cpuidle state details by querying the >> device-tree >> powerpc/powernv/cpuidle: Add workaround to enable fastsleep >> >> Shreyas B. Prabhu (6): >> powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from >> fast-sleep >> powerpc/powernv: Add OPAL call to save and restore >> powerpc: Adding macro for accessing Thread Switch Control Register >> powerpc/powernv: Add winkle infrastructure >> powerpc/powernv: Discover and enable winkle >> powerpc/powernv: Enter deepest supported idle state in offline >> >> Srivatsa S. Bhat (1): >> powerpc/powernv: Enable Offline CPUs to enter deep idle states >> >> arch/powerpc/include/asm/machdep.h | 4 + >> arch/powerpc/include/asm/opal.h | 10 ++ >> arch/powerpc/include/asm/paca.h | 3 + >> arch/powerpc/include/asm/ppc-opcode.h | 2 + >> arch/powerpc/include/asm/processor.h | 6 +- >> arch/powerpc/include/asm/reg.h | 1 + >> arch/powerpc/kernel/asm-offsets.c | 1 + >> arch/powerpc/kernel/exceptions-64s.S | 37 ++--- >> arch/powerpc/kernel/idle.c | 30 ++++ >> arch/powerpc/kernel/idle_power7.S | 83 +++++++++- >> arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + >> arch/powerpc/platforms/powernv/powernv.h | 8 + >> arch/powerpc/platforms/powernv/setup.c | 217 +++++++++++++++++++++++++ >> arch/powerpc/platforms/powernv/smp.c | 13 +- >> arch/powerpc/platforms/powernv/subcore.c | 15 ++ >> drivers/cpuidle/cpuidle-powernv.c | 40 ++++- >> 16 files changed, 439 insertions(+), 33 deletions(-) >> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
