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Date: Tue, 6 Jan 2009 22:19:33 -0500 From: "Ryan Hope" <rmh3093@...il.com> To: "Arjan van de Ven" <arjan@...radead.org> Cc: linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org, mingo@...e.hu, akpm@...ux-foundation.org, linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org, linux-acpi@...r.kernel.org Subject: Re: [PATCH 0/6] v2: Asynchronous function calls to speed up booting and more i can't boot with these patches... the kernel panic was something along the line of: ata_piix: device unavailable because of BAR 0 collisions -Ryan On 1/5/09, Arjan van de Ven <arjan@...radead.org> wrote: > > > > > Hi, > > Changes since last version > * some tweaks to the bootchart script to get better visualization > * added serialization points in the irq autodetector, module unloading > and at rootfs mounting (based on feedback from Linus and Andi) > * added a second libata patch to scan the partition tables from inside > the async code, without global serialization (based on Linus > suggestion). This saves a ton of boot time for my box with 2 sata > controllers > > I talked to David Howells to see if we could share the thread pool code > (all 35 lines of it), but his requirements are more or less > incompatible with mine. He needs priorities to be honored, while I need > to do strict sequencing of events, and this appears to be hardly > compatible, at least not without adding much more complexity than the > relatively simple thread code justifies. > > parts of the original announcement below; I've updated the two > bootcharts with the new code; basically my testbox is going from 2.75 > seconds to 1.0 seconds (approximately).. which is not a bad gain at all. > > I've also stuck the patches in a git tree; the git info is: > > The following changes since commit 238c6d54830c624f34ac9cf123ac04aebfca5013: > Linus Torvalds (1): > Merge git://git.kernel.org/.../agk/linux-2.6-dm > > are available in the git repository at: > > git://git.kernel.org/pub/scm/linux/kernel/git/arjan/linux-2.6-async.git > master > > Arjan van de Ven (6): > fastboot: Asynchronous function calls to speed up kernel boot > fastboot: make scsi probes asynchronous > fastboot: make the libata port scan asynchronous > fastboot: make ACPI bus drivers probe asynchronous > bootchart: improve output based on Dave Jones' feedback > fastboot: Make libata initialization even more async > > drivers/acpi/scan.c | 23 +++- > drivers/ata/libata-core.c | 96 ++++++++------- > drivers/scsi/scsi_scan.c | 3 + > drivers/scsi/sd.c | 109 ++++++++++------ > include/linux/async.h | 21 +++ > init/do_mounts.c | 2 + > init/main.c | 5 +- > kernel/Makefile | 3 +- > kernel/async.c | 307 > +++++++++++++++++++++++++++++++++++++++++++++ > kernel/irq/autoprobe.c | 5 + > kernel/module.c | 2 + > scripts/bootgraph.pl | 16 ++- > 12 files changed, 491 insertions(+), 101 deletions(-) > create mode 100644 include/linux/async.h > create mode 100644 kernel/async.c > > > should this go via -tip? is the first patch simple enough for .29 so that > the later ones can go via the maintainer trees after that? > > > ===== > > This patch series introduces asynchronous function calls. > The goal is still the same (boot faster), the method is entirely > different. > > Asynchronous function calls allow drivers and subsystems to do > operations asynchronously, while providing a mechanism to serialize > the asynchronous operations at "externally visible" locations, such as > device number registrations. > > As such, this approach is NOT a "full parallel kernel init". > For one, it keeps device numbers stable. For another, it's very much > opt-in for any code using this. > > Rather, it is more comparable to an out-of-order cpu, where computations > are done asynchronously, but are retired in program order. > > This series first introduces the infrastructure in patch 1, > and then adds users of this infrastructure (scsi in patch2, libata in > patch 3 and acpi in patch 4). > > To see this working, I uploaded a "before" and "after" kernel bootchart > for one of my testboxes at > > http://www.kernel.org/pub/linux/kernel/people/arjan/async/before.svg > http://www.kernel.org/pub/linux/kernel/people/arjan/async/after.svg > > [minor note; the "after" one also has Alan's suggestion to tweak the > serial config option] > > As you can see with inkscape (or gimp or any other svg viewer), there > is still some room for doing more things in parallel, but the 3 example > usage patches are a big win already. > > > -- > Arjan van de Ven Intel Open Source Technology Centre > For development, discussion and tips for power savings, > visit http://www.lesswatts.org > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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