Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il 06/05/2016 22:20, Paolo Valente ha scritto: ... I can now confirm that, because of a little bug, a fraction ranging from one third to half of the writeback bios for the writer is wrongly associated with the root group. I'm sending a bugfix. I'm retesting BFQ after this blk fix. If I

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il 06/05/2016 22:20, Paolo Valente ha scritto: ... I can now confirm that, because of a little bug, a fraction ranging from one third to half of the writeback bios for the writer is wrongly associated with the root group. I'm sending a bugfix. I'm retesting BFQ after this blk fix. If I

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 25/apr/2016, alle ore 22:30, Paolo ha scritto: > Il 25/04/2016 21:24, Tejun Heo ha scritto: >> Hello, Paolo. >> > > Hi > >> On Sat, Apr 23, 2016 at 09:07:47AM +0200, Paolo Valente wrote: >>> There is certainly something I don’t know here, because I don’t

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 25/apr/2016, alle ore 22:30, Paolo ha scritto: > Il 25/04/2016 21:24, Tejun Heo ha scritto: >> Hello, Paolo. >> > > Hi > >> On Sat, Apr 23, 2016 at 09:07:47AM +0200, Paolo Valente wrote: >>> There is certainly something I don’t know here, because I don’t >>> understand why there

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il 25/04/2016 21:24, Tejun Heo ha scritto: Hello, Paolo. Hi On Sat, Apr 23, 2016 at 09:07:47AM +0200, Paolo Valente wrote: There is certainly something I don’t know here, because I don’t understand why there is also a workqueue containing root-group I/O all the time, if the only process

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il 25/04/2016 21:24, Tejun Heo ha scritto: Hello, Paolo. Hi On Sat, Apr 23, 2016 at 09:07:47AM +0200, Paolo Valente wrote: There is certainly something I don’t know here, because I don’t understand why there is also a workqueue containing root-group I/O all the time, if the only process

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, Paolo. On Sat, Apr 23, 2016 at 09:07:47AM +0200, Paolo Valente wrote: > There is certainly something I don’t know here, because I don’t > understand why there is also a workqueue containing root-group I/O > all the time, if the only process doing I/O belongs to a different > (sub)group.

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, Paolo. On Sat, Apr 23, 2016 at 09:07:47AM +0200, Paolo Valente wrote: > There is certainly something I don’t know here, because I don’t > understand why there is also a workqueue containing root-group I/O > all the time, if the only process doing I/O belongs to a different > (sub)group.

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 22/apr/2016, alle ore 21:32, Tejun Heo ha scritto: > Hello, Paolo. > > On Fri, Apr 22, 2016 at 09:05:14PM +0200, Paolo Valente wrote: >>> Ah, right, I was confused. cic is always associated with the task and >>> yes a writeback worker can trigger blkcg changed

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 22/apr/2016, alle ore 21:32, Tejun Heo ha scritto: > Hello, Paolo. > > On Fri, Apr 22, 2016 at 09:05:14PM +0200, Paolo Valente wrote: >>> Ah, right, I was confused. cic is always associated with the task and >>> yes a writeback worker can trigger blkcg changed events frequently as

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, Paolo. On Fri, Apr 22, 2016 at 09:05:14PM +0200, Paolo Valente wrote: > > Ah, right, I was confused. cic is always associated with the task and > > yes a writeback worker can trigger blkcg changed events frequently as > > it walks through different cgroups. Is this an issue? > > That’s

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, Paolo. On Fri, Apr 22, 2016 at 09:05:14PM +0200, Paolo Valente wrote: > > Ah, right, I was confused. cic is always associated with the task and > > yes a writeback worker can trigger blkcg changed events frequently as > > it walks through different cgroups. Is this an issue? > > That’s

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 22/apr/2016, alle ore 20:41, Tejun Heo ha scritto: > Hello, Paolo. > > On Fri, Apr 22, 2016 at 08:19:47PM +0200, Paolo Valente wrote: >>> So, a kworker would jump through different workqueues and issue IOs >>> for different writeback domains and the context can't be

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 22/apr/2016, alle ore 20:41, Tejun Heo ha scritto: > Hello, Paolo. > > On Fri, Apr 22, 2016 at 08:19:47PM +0200, Paolo Valente wrote: >>> So, a kworker would jump through different workqueues and issue IOs >>> for different writeback domains and the context can't be tied to the >>>

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, Paolo. On Fri, Apr 22, 2016 at 08:19:47PM +0200, Paolo Valente wrote: > > So, a kworker would jump through different workqueues and issue IOs > > for different writeback domains and the context can't be tied to the > > issuing task. The cgroup membership should be determined directly > >

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, Paolo. On Fri, Apr 22, 2016 at 08:19:47PM +0200, Paolo Valente wrote: > > So, a kworker would jump through different workqueues and issue IOs > > for different writeback domains and the context can't be tied to the > > issuing task. The cgroup membership should be determined directly > >

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 22/apr/2016, alle ore 20:13, Tejun Heo ha scritto: > Hello, Paolo. > > On Wed, Apr 20, 2016 at 11:32:23AM +0200, Paolo wrote: >> This malfunction seems related to a blkcg behavior that I did not >> expect: the sequential writer changes group continuously. It moves >>

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 22/apr/2016, alle ore 20:13, Tejun Heo ha scritto: > Hello, Paolo. > > On Wed, Apr 20, 2016 at 11:32:23AM +0200, Paolo wrote: >> This malfunction seems related to a blkcg behavior that I did not >> expect: the sequential writer changes group continuously. It moves >> from the root

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, Paolo. On Wed, Apr 20, 2016 at 11:32:23AM +0200, Paolo wrote: > This malfunction seems related to a blkcg behavior that I did not > expect: the sequential writer changes group continuously. It moves > from the root group to its correct group, and back. Here is the > output of > > egrep

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, Paolo. On Wed, Apr 20, 2016 at 11:32:23AM +0200, Paolo wrote: > This malfunction seems related to a blkcg behavior that I did not > expect: the sequential writer changes group continuously. It moves > from the root group to its correct group, and back. Here is the > output of > > egrep

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

[Resending in plain text] Il 11/02/2016 23:28, Tejun Heo ha scritto: Hello, > > On Mon, Feb 01, 2016 at 11:12:46PM +0100, Paolo Valente wrote: >> From: Arianna Avanzini >> >> Complete support for full hierarchical scheduling, with a cgroups >> interface. The name

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

[Resending in plain text] Il 11/02/2016 23:28, Tejun Heo ha scritto: Hello, > > On Mon, Feb 01, 2016 at 11:12:46PM +0100, Paolo Valente wrote: >> From: Arianna Avanzini >> >> Complete support for full hierarchical scheduling, with a cgroups >> interface. The name of the added policy is bfq.

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, again. I forgot to cc the source code for the following. > A-2. test-rawio.c $DEV 8 16 It's a simple program which issues random IOs to the raw device. The above will issue 16 concurrent 4k IOs. Thanks. -- tejun #define _GNU_SOURCE #define _FILE_OFFSET_BITS 64 #include #include

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, again. I forgot to cc the source code for the following. > A-2. test-rawio.c $DEV 8 16 It's a simple program which issues random IOs to the raw device. The above will issue 16 concurrent 4k IOs. Thanks. -- tejun #define _GNU_SOURCE #define _FILE_OFFSET_BITS 64 #include #include

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, On Wed, Feb 17, 2016 at 10:07:16AM +0100, Paolo Valente wrote: > > * How's writeback handled? > > If I understood correctly your question, then the answer is that > there is no special/automatic handling of writeback queues. Thus, > unless the user explicitly inserts flushing threads in

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, On Wed, Feb 17, 2016 at 10:07:16AM +0100, Paolo Valente wrote: > > * How's writeback handled? > > If I understood correctly your question, then the answer is that > there is no special/automatic handling of writeback queues. Thus, > unless the user explicitly inserts flushing threads in

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 11/feb/2016, alle ore 23:28, Tejun Heo ha scritto: > Hello, > > On Mon, Feb 01, 2016 at 11:12:46PM +0100, Paolo Valente wrote: >> From: Arianna Avanzini >> >> Complete support for full hierarchical scheduling, with a cgroups >>

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Il giorno 11/feb/2016, alle ore 23:28, Tejun Heo ha scritto: > Hello, > > On Mon, Feb 01, 2016 at 11:12:46PM +0100, Paolo Valente wrote: >> From: Arianna Avanzini >> >> Complete support for full hierarchical scheduling, with a cgroups >> interface. The name of the added policy is bfq. >> >>

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, On Mon, Feb 01, 2016 at 11:12:46PM +0100, Paolo Valente wrote: > From: Arianna Avanzini > > Complete support for full hierarchical scheduling, with a cgroups > interface. The name of the added policy is bfq. > > Weights can be assigned explicitly to groups and processes through the >

Re: [PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

Hello, On Mon, Feb 01, 2016 at 11:12:46PM +0100, Paolo Valente wrote: > From: Arianna Avanzini > > Complete support for full hierarchical scheduling, with a cgroups > interface. The name of the added policy is bfq. > > Weights can be assigned explicitly to groups

[PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

From: Arianna Avanzini Complete support for full hierarchical scheduling, with a cgroups interface. The name of the added policy is bfq. Weights can be assigned explicitly to groups and processes through the cgroups interface, differently from what happens, for single processes, if the cgroups

[PATCH RFC 10/22] block, bfq: add full hierarchical scheduling and cgroups support

From: Arianna Avanzini Complete support for full hierarchical scheduling, with a cgroups interface. The name of the added policy is bfq. Weights can be assigned explicitly to groups and processes through the cgroups interface, differently from what happens, for