Linaro-mm-sig April 2017

linaro-mm-sig@lists.linaro.org

9 participants
9 discussions

Re: [Linaro-mm-sig] [PATCH] dma-buf: avoid scheduling on fence status query v2

by Gustavo Padovan

2017-04-26 Christian König <deathsimple(a)vodafone.de>: > Am 26.04.2017 um 16:46 schrieb Andres Rodriguez: > > When a timeout of zero is specified, the caller is only interested in > > the fence status. > > > > In the current implementation, dma_fence_default_wait will always call > > schedule_timeout() at least once for an unsignaled fence. This adds a > > significant overhead to a fence status query. > > > > Avoid this overhead by returning early if a zero timeout is specified. > > > > v2: move early return after enable_signaling > > > > Signed-off-by: Andres Rodriguez <andresx7(a)gmail.com> > > Reviewed-by: Christian König <christian.koenig(a)amd.com> pushed to drm-misc-next. Thanks all. Gustavo

6 years, 10 months

[PATCH] dma-buf: avoid scheduling on fence status query v2

by Andres Rodriguez

When a timeout of zero is specified, the caller is only interested in the fence status. In the current implementation, dma_fence_default_wait will always call schedule_timeout() at least once for an unsignaled fence. This adds a significant overhead to a fence status query. Avoid this overhead by returning early if a zero timeout is specified. v2: move early return after enable_signaling Signed-off-by: Andres Rodriguez <andresx7(a)gmail.com> --- If I'm understanding correctly, I don't think we need to register the default wait callback. But if that isn't the case please let me know. This patch has the same perf improvements as v1. drivers/dma-buf/dma-fence.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 0918d3f..57da14c 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -402,6 +402,11 @@ dma_fence_default_wait(struct dma_fence *fence, bool intr, signed long timeout) } } + if (!timeout) { + ret = 0; + goto out; + } + cb.base.func = dma_fence_default_wait_cb; cb.task = current; list_add(&cb.base.node, &fence->cb_list); -- 2.9.3

6 years, 11 months

Re: [Linaro-mm-sig] [PATCH] dma-buf: avoid scheduling on fence status query

by Andres Rodriguez

On 2017-04-26 06:13 AM, Christian König wrote: > Am 26.04.2017 um 11:59 schrieb Dave Airlie: >> On 26 April 2017 at 17:20, Christian König <deathsimple(a)vodafone.de> >> wrote: >>> NAK, I'm wondering how often I have to reject that change. We should >>> probably add a comment here. >>> >>> Even with a zero timeout we still need to enable signaling, otherwise >>> some >>> fence will never signal if userspace just polls on them. >>> >>> If a caller is only interested in the fence status without enabling the >>> signaling it should call dma_fence_is_signaled() instead. >> Can we not move the return 0 (with spin unlock) down after we enabling >> signalling, but before >> we enter the schedule_timeout(1)? > > Yes, that would be an option. > I was actually arguing with Dave about this on IRC yesterday. Seems like I owe him a beer now. -Andres > Christian. > >> >> Dave. > >

6 years, 11 months

Re: [Linaro-mm-sig] [PATCH] dma-buf: avoid scheduling on fence status query

by Dave Airlie

On 26 April 2017 at 17:20, Christian König <deathsimple(a)vodafone.de> wrote: > NAK, I'm wondering how often I have to reject that change. We should > probably add a comment here. > > Even with a zero timeout we still need to enable signaling, otherwise some > fence will never signal if userspace just polls on them. > > If a caller is only interested in the fence status without enabling the > signaling it should call dma_fence_is_signaled() instead. Can we not move the return 0 (with spin unlock) down after we enabling signalling, but before we enter the schedule_timeout(1)? Dave.

6 years, 11 months

Re: [Linaro-mm-sig] [PATCH] dma-buf: avoid scheduling on fence status query

by Andres Rodriguez

CC a few extra lists I missed. Regards, Andres On 2017-04-25 09:36 PM, Andres Rodriguez wrote: > When a timeout of zero is specified, the caller is only interested in > the fence status. > > In the current implementation, dma_fence_default_wait will always call > schedule_timeout() at least once for an unsignaled fence. This adds a > significant overhead to a fence status query. > > Avoid this overhead by returning early if a zero timeout is specified. > > Signed-off-by: Andres Rodriguez <andresx7(a)gmail.com> > --- > > This heavily affects the performance of the Source2 engine running on > radv. > > This patch improves dota2(radv) perf on a i7-6700k+RX480 system from > 72fps->81fps. > > drivers/dma-buf/dma-fence.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c > index 0918d3f..348e9e2 100644 > --- a/drivers/dma-buf/dma-fence.c > +++ b/drivers/dma-buf/dma-fence.c > @@ -380,6 +380,9 @@ dma_fence_default_wait(struct dma_fence *fence, bool intr, signed long timeout) > if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) > return ret; > > + if (!timeout) > + return 0; > + > spin_lock_irqsave(fence->lock, flags); > > if (intr && signal_pending(current)) { >

6 years, 11 months

[PATCHv4 00/12] Ion cleanup in preparation for moving out of staging

by Laura Abbott

Hi, This is v4 of the series to cleanup to Ion. Greg took some of the patches that weren't CMA related already. There was a minor bisectability problem with the CMA APIs so this is a new version to address that. I also addressed some minor comments on the patch to collapse header files. Thanks, Laura Laura Abbott (12): cma: Store a name in the cma structure cma: Introduce cma_for_each_area staging: android: ion: Use CMA APIs directly staging: android: ion: Stop butchering the DMA address staging: android: ion: Break the ABI in the name of forward progress staging: android: ion: Get rid of ion_phys_addr_t staging: android: ion: Collapse internal header files staging: android: ion: Rework heap registration/enumeration staging: android: ion: Drop ion_map_kernel interface staging: android: ion: Remove ion_handle and ion_client staging: android: ion: Set query return value staging/android: Update Ion TODO list arch/powerpc/kvm/book3s_hv_builtin.c | 3 +- drivers/base/dma-contiguous.c | 5 +- drivers/staging/android/TODO | 21 +- drivers/staging/android/ion/Kconfig | 32 + drivers/staging/android/ion/Makefile | 11 +- drivers/staging/android/ion/compat_ion.c | 152 ----- drivers/staging/android/ion/compat_ion.h | 29 - drivers/staging/android/ion/ion-ioctl.c | 55 +- drivers/staging/android/ion/ion.c | 812 ++---------------------- drivers/staging/android/ion/ion.h | 386 ++++++++--- drivers/staging/android/ion/ion_carveout_heap.c | 21 +- drivers/staging/android/ion/ion_chunk_heap.c | 16 +- drivers/staging/android/ion/ion_cma_heap.c | 120 ++-- drivers/staging/android/ion/ion_heap.c | 68 -- drivers/staging/android/ion/ion_page_pool.c | 3 +- drivers/staging/android/ion/ion_priv.h | 453 ------------- drivers/staging/android/ion/ion_system_heap.c | 39 +- drivers/staging/android/uapi/ion.h | 36 +- include/linux/cma.h | 6 +- mm/cma.c | 31 +- mm/cma.h | 1 + mm/cma_debug.c | 2 +- 22 files changed, 524 insertions(+), 1778 deletions(-) delete mode 100644 drivers/staging/android/ion/compat_ion.c delete mode 100644 drivers/staging/android/ion/compat_ion.h delete mode 100644 drivers/staging/android/ion/ion_priv.h -- 2.7.4

6 years, 12 months

[PATCHv3 00/22] Ion clean up in preparation in moving out of staging

by Laura Abbott

Hi, This is v3 of the series to do some serious Ion cleanup in preparation for moving out of staging. I didn't hear much on v2 so I'm going to assume people are okay with the series as is. I know there were still some open questions about moving away from /dev/ion but in the interest of small steps I'd like to go ahead and merge this series assuming there are no more major objections. More work can happen on top of this. Changes from v2: - Dropped the RFC tag - Minor bisectability fixes - Sumit's comment about CMA naming - Updated the TODO list Thanks, Laura Laura Abbott (22): cma: Store a name in the cma structure cma: Introduce cma_for_each_area staging: android: ion: Remove dmap_cnt staging: android: ion: Remove alignment from allocation field staging: android: ion: Duplicate sg_table staging: android: ion: Call dma_map_sg for syncing and mapping staging: android: ion: Remove page faulting support staging: android: ion: Remove crufty cache support staging: android: ion: Remove custom ioctl interface staging: android: ion: Remove import interface staging: android: ion: Remove duplicate ION_IOC_MAP staging: android: ion: Remove old platform support staging: android: ion: Use CMA APIs directly staging: android: ion: Stop butchering the DMA address staging: android: ion: Break the ABI in the name of forward progress staging: android: ion: Get rid of ion_phys_addr_t staging: android: ion: Collapse internal header files staging: android: ion: Rework heap registration/enumeration staging: android: ion: Drop ion_map_kernel interface staging: android: ion: Remove ion_handle and ion_client staging: android: ion: Set query return value staging/android: Update Ion TODO list arch/powerpc/kvm/book3s_hv_builtin.c | 3 +- drivers/base/dma-contiguous.c | 5 +- drivers/staging/android/TODO | 21 +- drivers/staging/android/ion/Kconfig | 56 +- drivers/staging/android/ion/Makefile | 18 +- drivers/staging/android/ion/compat_ion.c | 195 ---- drivers/staging/android/ion/compat_ion.h | 29 - drivers/staging/android/ion/hisilicon/Kconfig | 5 - drivers/staging/android/ion/hisilicon/Makefile | 1 - drivers/staging/android/ion/hisilicon/hi6220_ion.c | 113 -- drivers/staging/android/ion/ion-ioctl.c | 85 +- drivers/staging/android/ion/ion.c | 1168 +++----------------- drivers/staging/android/ion/ion.h | 389 +++++-- drivers/staging/android/ion/ion_carveout_heap.c | 37 +- drivers/staging/android/ion/ion_chunk_heap.c | 27 +- drivers/staging/android/ion/ion_cma_heap.c | 125 +-- drivers/staging/android/ion/ion_dummy_driver.c | 155 --- drivers/staging/android/ion/ion_heap.c | 68 -- drivers/staging/android/ion/ion_of.c | 184 --- drivers/staging/android/ion/ion_of.h | 37 - drivers/staging/android/ion/ion_page_pool.c | 6 +- drivers/staging/android/ion/ion_priv.h | 473 -------- drivers/staging/android/ion/ion_system_heap.c | 53 +- drivers/staging/android/ion/ion_test.c | 305 ----- drivers/staging/android/ion/tegra/Makefile | 1 - drivers/staging/android/ion/tegra/tegra_ion.c | 80 -- drivers/staging/android/uapi/ion.h | 86 +- drivers/staging/android/uapi/ion_test.h | 69 -- include/linux/cma.h | 6 +- mm/cma.c | 31 +- mm/cma.h | 1 + mm/cma_debug.c | 2 +- 32 files changed, 620 insertions(+), 3214 deletions(-) delete mode 100644 drivers/staging/android/ion/compat_ion.c delete mode 100644 drivers/staging/android/ion/compat_ion.h delete mode 100644 drivers/staging/android/ion/hisilicon/Kconfig delete mode 100644 drivers/staging/android/ion/hisilicon/Makefile delete mode 100644 drivers/staging/android/ion/hisilicon/hi6220_ion.c delete mode 100644 drivers/staging/android/ion/ion_dummy_driver.c delete mode 100644 drivers/staging/android/ion/ion_of.c delete mode 100644 drivers/staging/android/ion/ion_of.h delete mode 100644 drivers/staging/android/ion/ion_priv.h delete mode 100644 drivers/staging/android/ion/ion_test.c delete mode 100644 drivers/staging/android/ion/tegra/Makefile delete mode 100644 drivers/staging/android/ion/tegra/tegra_ion.c delete mode 100644 drivers/staging/android/uapi/ion_test.h -- 2.7.4

6 years, 12 months

Re: [Linaro-mm-sig] [PATCHv3 17/22] staging: android: ion: Collapse internal header files

by Laura Abbott

On 04/08/2017 11:12 AM, Emil Velikov wrote: > Hi Laura, > > Couple of trivial nitpicks below. > > On 3 April 2017 at 19:57, Laura Abbott <labbott(a)redhat.com> wrote: > >> --- a/drivers/staging/android/ion/ion.h >> +++ b/drivers/staging/android/ion/ion.h >> @@ -1,5 +1,5 @@ >> /* >> - * drivers/staging/android/ion/ion.h >> + * drivers/staging/android/ion/ion_priv.h > Does not match the actual filename. > >> * >> * Copyright (C) 2011 Google, Inc. >> * >> @@ -14,24 +14,26 @@ >> * >> */ >> >> -#ifndef _LINUX_ION_H >> -#define _LINUX_ION_H >> +#ifndef _ION_PRIV_H >> +#define _ION_PRIV_H >> > Ditto. > >> +#include <linux/device.h> >> +#include <linux/dma-direction.h> >> +#include <linux/kref.h> >> +#include <linux/mm_types.h> >> +#include <linux/mutex.h> >> +#include <linux/rbtree.h> >> +#include <linux/sched.h> >> +#include <linux/shrinker.h> >> #include <linux/types.h> >> +#include <linux/miscdevice.h> >> >> #include "../uapi/ion.h" >> > You don't want to use "../" in includes. Perhaps address with another > patch, if you haven't already ? > There isn't a better option until this driver moves out of staging. Once it moves out it can be fixed up. Thanks, Laura > Regards, > Emil >

7 years

Re: [Linaro-mm-sig] [PATCH] dma-buf: align debugfs output

by Sumit Semwal

Hi Russell, On 31 March 2017 at 15:33, Russell King <rmk+kernel(a)armlinux.org.uk> wrote: > Align the heading with the values output from debugfs. > > Signed-off-by: Russell King <rmk+kernel(a)armlinux.org.uk> Thanks for your patch; applied to drm-misc-next. > --- > drivers/dma-buf/dma-buf.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c > index ebaf1923ad6b..f72aaacbe023 100644 > --- a/drivers/dma-buf/dma-buf.c > +++ b/drivers/dma-buf/dma-buf.c > @@ -1072,7 +1072,8 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused) > return ret; > > seq_puts(s, "\nDma-buf Objects:\n"); > - seq_puts(s, "size\tflags\tmode\tcount\texp_name\n"); > + seq_printf(s, "%-8s\t%-8s\t%-8s\t%-8s\texp_name\n", > + "size", "flags", "mode", "count"); > > list_for_each_entry(buf_obj, &db_list.head, list_node) { > ret = mutex_lock_interruptible(&buf_obj->lock); > -- > 2.7.4 > Best, Sumit.

7 years

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Linaro-mm-sig April 2017