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...man:samba(7) man:smb.conf(5) Main PID: 4339 (samba) Status: "smbd: ready to serve connections..." Tasks: 61 (limit: 4915) Memory: 190.5M CGroup: /system.slice/samba-ad-dc.service +-4339 samba: root process +-4340 samba: tfork waiter process +-4341 samba: task[s3fs] pre-fork master +-4342 samba: tfork waiter process +-4343 samba: task[rpc] pre-fork master +-4344 samba: tfork waiter process +-4345 samba: tfork waiter process +-4346 /usr/sbin/smbd -D --option...

...: 4339 (samba) > > Status: "smbd: ready to serve connections..." > > Tasks: 61 (limit: 4915) > > Memory: 190.5M > > CGroup: /system.slice/samba-ad-dc.service > > +-4339 samba: root process > > +-4340 samba: tfork waiter process > > +-4341 samba: task[s3fs] pre-fork master > > +-4342 samba: tfork waiter process > > +-4343 samba: task[rpc] pre-fork master > > +-4344 samba: tfork waiter process > > +-4345 samba: tfork waiter pro...

...==== and mine ended with the 2nd to last line, that is "Setting password for administrator" did not show up. While samba is trying to start I see a lot of processes: =========================== 3388 ? Ss 0:00 samba: root process . 3389 ? S 0:00 samba: tfork waiter process(3390) 3390 ? S 0:00 samba: task[s3fs] pre-fork master 3391 ? S 0:00 samba: tfork waiter process(3393) 3392 ? S 0:00 samba: tfork waiter process(3394) 3393 ? S 0:00 samba: task[rpc] pre-fork master 3394 ? Ss 0:00 /usr/local/samb...

...: 4339 (samba) > > Status: "smbd: ready to serve connections..." > > Tasks: 61 (limit: 4915) > > Memory: 190.5M > > CGroup: /system.slice/samba-ad-dc.service > > +-4339 samba: root process > > +-4340 samba: tfork waiter process > > +-4341 samba: task[s3fs] pre-fork master > > +-4342 samba: tfork waiter process > > +-4343 samba: task[rpc] pre-fork master > > +-4344 samba: tfork waiter process > > +-4345 samba: tfork waiter pro...

...aolo Bonzini wrote: > Il 13/03/2014 12:21, David Vrabel ha scritto: >> On 12/03/14 18:54, Waiman Long wrote: >>> This patch adds para-virtualization support to the queue spinlock in >>> the same way as was done in the PV ticket lock code. In essence, the >>> lock waiters will spin for a specified number of times (QSPIN_THRESHOLD >>> = 2^14) and then halted itself. The queue head waiter will spins >>> 2*QSPIN_THRESHOLD times before halting itself. When it has spinned >>> QSPIN_THRESHOLD times, the queue head will assume that the lock >...

...aolo Bonzini wrote: > Il 13/03/2014 12:21, David Vrabel ha scritto: >> On 12/03/14 18:54, Waiman Long wrote: >>> This patch adds para-virtualization support to the queue spinlock in >>> the same way as was done in the PV ticket lock code. In essence, the >>> lock waiters will spin for a specified number of times (QSPIN_THRESHOLD >>> = 2^14) and then halted itself. The queue head waiter will spins >>> 2*QSPIN_THRESHOLD times before halting itself. When it has spinned >>> QSPIN_THRESHOLD times, the queue head will assume that the lock >...

On 12/03/14 18:54, Waiman Long wrote: > This patch adds para-virtualization support to the queue spinlock in > the same way as was done in the PV ticket lock code. In essence, the > lock waiters will spin for a specified number of times (QSPIN_THRESHOLD > = 2^14) and then halted itself. The queue head waiter will spins > 2*QSPIN_THRESHOLD times before halting itself. When it has spinned > QSPIN_THRESHOLD times, the queue head will assume that the lock > holder may be scheduled...

On 12/03/14 18:54, Waiman Long wrote: > This patch adds para-virtualization support to the queue spinlock in > the same way as was done in the PV ticket lock code. In essence, the > lock waiters will spin for a specified number of times (QSPIN_THRESHOLD > = 2^14) and then halted itself. The queue head waiter will spins > 2*QSPIN_THRESHOLD times before halting itself. When it has spinned > QSPIN_THRESHOLD times, the queue head will assume that the lock > holder may be scheduled...

...CGroup: /system.slice/samba-ad-dc.service ?? 770 "samba: root process" "" "" "" "" "" "" "" "" "" "" "" "" > ?? 854 "samba: tfork waiter process(855)" "" "" "" "" "" "" "" ""> ?? 855 "samba: task[s3fs] pre-fork master" "" "" "" "" "" "" "" ">...

...s > > CGroup: /system.slice/samba-ad-dc.service > > ?? 770 "samba: root process" "" "" "" "" "" "" "" "" "" "" "" "" > > > ?? 854 "samba: tfork waiter process(855)" "" "" "" "" "" "" "" ""> > > ?? 855 "samba: task[s3fs] pre-fork master" "" "" "" "" "" "" "" "> > &g...

...--no-process-group $SAMBAOPTIONS (code=exited, status=1/FAILURE) Main PID: 21886 (code=exited, status=1/FAILURE) Status: "samba: ready to serve connections..." Tasks: 8 (limit: 4701) Memory: 32.0M CGroup: /system.slice/samba-ad-dc.service ??21887 samba: tfork waiter process(21888) ??21889 samba: tfork waiter process(21890) ??21891 samba: tfork waiter process(21895) ??21896 samba: tfork waiter process(21898) ??21899 samba: tfork waiter process(21901) ??21902 samba: tfork waiter process(21906)...

...include "intr.h" +#include "syncpt.h" +#include "cdma.h" +#include "channel.h" +#include "dev.h" + +struct host1x_fence { + struct dma_fence base; + spinlock_t lock; + + struct host1x_syncpt *syncpt; + u32 threshold; + + struct host1x *host; + void *waiter; + + char timeline_name[10]; +}; + +static inline struct host1x_fence *to_host1x_fence(struct dma_fence *fence) +{ + return (struct host1x_fence *)fence; +} + +static const char *host1x_fence_get_driver_name(struct dma_fence *fence) +{ + return "host1x"; +} + +static const char *host1x_fe...

From: Thierry Reding <treding at nvidia.com> This set of patches adds support for fences to Tegra DRM and complements the fence FD support for Nouveau. Technically this isn't necessary for a fence-based synchronization loop with Nouveau because the KMS core takes care of all that, but engines behind host1x can use the IOCTL extensions provided here to emit fence FDs that in turn can be

Il 13/03/2014 12:21, David Vrabel ha scritto: > On 12/03/14 18:54, Waiman Long wrote: >> This patch adds para-virtualization support to the queue spinlock in >> the same way as was done in the PV ticket lock code. In essence, the >> lock waiters will spin for a specified number of times (QSPIN_THRESHOLD >> = 2^14) and then halted itself. The queue head waiter will spins >> 2*QSPIN_THRESHOLD times before halting itself. When it has spinned >> QSPIN_THRESHOLD times, the queue head will assume that the lock >> holder...

...WORD2.RT ... WORD25.RT 1 1 My 100 friend 200 ... ... 1 2 John's 250 dog 320 ... ... 1 3 His 120 waiter 400 ... ... 2 1 My 100 friend 200 ... ... 2 2 John's 250 dog 320 ... ... 2 3 His 120...

...y kind of queueing gets you into a world of hurt with virt. The simple test-and-set lock (as per the above) still sucks due to lock holder preemption, but at least the suckage doesn't queue. Because with queueing you not only have to worry about the lock holder getting preemption, but also the waiter(s). Take the situation of 3 (v)CPUs where cpu0 holds the lock but is preempted. cpu1 queues, cpu2 queues. Then cpu1 gets preempted, after which cpu0 gets back online. The simple test-and-set lock will now let cpu2 acquire. Your queue however will just sit there spinning, waiting for cpu1 to come...

...y kind of queueing gets you into a world of hurt with virt. The simple test-and-set lock (as per the above) still sucks due to lock holder preemption, but at least the suckage doesn't queue. Because with queueing you not only have to worry about the lock holder getting preemption, but also the waiter(s). Take the situation of 3 (v)CPUs where cpu0 holds the lock but is preempted. cpu1 queues, cpu2 queues. Then cpu1 gets preempted, after which cpu0 gets back online. The simple test-and-set lock will now let cpu2 acquire. Your queue however will just sit there spinning, waiting for cpu1 to come...

...> >Thanks. > > Yes, the performance gain is worth it. The primary goal is to be not worse > than ticket spinlock in light load situation which is the most common case. > This feature is need to achieve that. Ok. I've seen merit in pvqspinlock even with slightly slower first-waiter, so I would have happily sacrificed those horrible branches. (I prefer elegant to optimized code, but I can see why we want to be strictly better than ticketlock.) Peter mentioned that we are focusing on bare-metal patches, so I'll withold my other paravirt rants until they are polished. And...

...> >Thanks. > > Yes, the performance gain is worth it. The primary goal is to be not worse > than ticket spinlock in light load situation which is the most common case. > This feature is need to achieve that. Ok. I've seen merit in pvqspinlock even with slightly slower first-waiter, so I would have happily sacrificed those horrible branches. (I prefer elegant to optimized code, but I can see why we want to be strictly better than ticketlock.) Peter mentioned that we are focusing on bare-metal patches, so I'll withold my other paravirt rants until they are polished. And...

On 07/01/2014 01:35 PM, Peter Zijlstra wrote: > On Sat, Jun 28, 2014 at 02:47:04PM +0530, Raghavendra K T wrote: >> In virtualized environment there are mainly three problems >> related to spinlocks that affects performance. >> 1. LHP (lock holder preemption) >> 2. Lock Waiter Preemption (LWP) >> 3. Starvation/fairness >> >> Though Ticketlocks solve fairness problem it worsens LWP, LHP problems. Though >> pv-ticketlocks tried to address these problems we can further improve at the >> cost of relaxed fairness. The following patch tries to a...