[uml-devel] Any complaints about parallel make in 2.6.10-rc?

[uml-devel] Any complaints about parallel make in 2.6.10-rc?

[Blaisorblade]

I've just tried doing this test on a clean tree 2.6.10-rc3, and it worked very 
well (I interrupted it after enough progress):

make ARCH=um -j10

Since somebody (maybe Christopher Aker) said that parallel make was broken in 
2.6.10-rc, I'm asking to report it in detail, if the complaint is correct.

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade


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[uml-devel] Re: [uml-user] Any complaints about parallel make in 2.6.10-rc?

[Christopher S. Aker]

> Since somebody (maybe Christopher Aker) said that parallel make was broken in
> 2.6.10-rc, I'm asking to report it in detail, if the complaint is correct.

Odd.. "make ARCH=um -jN" works, but "make -jN ARCH=um" doesn't.  How did I miss that?

-Chris



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[uml-devel] Re: [uml-user] Any complaints about parallel make in 2.6.10-rc?

[Blaisorblade]

[-- Attachment #1: Type: text/plain, Size: 908 bytes --]

On Tuesday 07 December 2004 06:47, Christopher S. Aker wrote:
> > Since somebody (maybe Christopher Aker) said that parallel make was
> > broken in 2.6.10-rc, I'm asking to report it in detail, if the complaint
> > is correct.
>
> Odd.. "make ARCH=um -jN" works, but "make -jN ARCH=um" doesn't.  How did I
> miss that?
??? Well, missing such a difference is *obvious*, since it does not make sense 
at all.

I'm instead discovering a more interesting issue, due to some mainline updates 
to Kconfig, preventing Ramdisk code to build. Trivial fix attached. A less 
trivial fix, i.e. uml-depend-out-main-block-Kconfig.patch, cleaning things up 
definitely (i.e. going to drop arch/um/Kconfig_block , which is a selected 
duplicate of what's in drivers/block/Kconfig), is attached too.
> -Chris

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade

[-- Attachment #2: uml-kconfig-block-update.patch --]
[-- Type: text/x-diff, Size: 1885 bytes --]



Update the text of Kconfig_block to match mainline changes. I'll later maybe
submit a cleanup about the duplication of part of drivers/block/Kconfig in
Kconfig_block - with appropriate fixes, we could just use
drivers/block/Kconfig.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
---

 linux-2.6.10-rc-paolo/arch/um/Kconfig_block |   20 +++++++++++++++++++-
 1 files changed, 19 insertions(+), 1 deletion(-)

diff -puN arch/um/Kconfig_block~uml-kconfig-block-update arch/um/Kconfig_block
--- linux-2.6.10-rc/arch/um/Kconfig_block~uml-kconfig-block-update	2004-12-07 07:12:44.045672960 +0100
+++ linux-2.6.10-rc-paolo/arch/um/Kconfig_block	2004-12-07 07:12:44.048672504 +0100
@@ -43,14 +43,32 @@ config BLK_DEV_NBD
 config BLK_DEV_RAM
 	tristate "RAM disk support"
 
+config BLK_DEV_RAM_COUNT
+	int "Default number of RAM disks" if BLK_DEV_RAM
+	default "16"
+	help
+	  The default value is 16 RAM disks. Change this if you know what
+	  are doing. If you boot from a filesystem that needs to be extracted
+	  in memory, you will need at least one RAM disk (e.g. root on cramfs).
+
 config BLK_DEV_RAM_SIZE
-	int "Default RAM disk size"
+	int "Default RAM disk size (kbytes)"
 	depends on BLK_DEV_RAM
 	default "4096"
+	help
+	  The default value is 4096 kilobytes. Only change this if you know
+	  what are you doing. If you are using IBM S/390, then set this to
+	  8192.
 
 config BLK_DEV_INITRD
 	bool "Initial RAM disk (initrd) support"
 	depends on BLK_DEV_RAM=y
+	help
+	  The initial RAM disk is a RAM disk that is loaded by the boot loader
+	  (loadlin or lilo) and that is mounted as root before the normal boot
+	  procedure. It is typically used to load modules needed to mount the
+	  "real" root file system, etc. See <file:Documentation/initrd.txt>
+	  for details.
 
 #Copied directly from drivers/block/Kconfig
 config INITRAMFS_SOURCE
_

[-- Attachment #3: uml-depend-out-main-block-Kconfig.patch --]
[-- Type: text/x-diff, Size: 2274 bytes --]


Finally, we end with this the need to update arch/um/Kconfig_block with
changes in drivers/block/Kconfig.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
---

 linux-2.6.10-rc-paolo/arch/um/Kconfig       |    2 +-
 linux-2.6.10-rc-paolo/drivers/block/Kconfig |    7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff -puN drivers/block/Kconfig~uml-depend-out-main-block-Kconfig drivers/block/Kconfig
--- linux-2.6.10-rc/drivers/block/Kconfig~uml-depend-out-main-block-Kconfig	2004-12-07 07:20:37.450704456 +0100
+++ linux-2.6.10-rc-paolo/drivers/block/Kconfig	2004-12-07 07:20:37.456703544 +0100
@@ -6,7 +6,7 @@ menu "Block devices"
 
 config BLK_DEV_FD
 	tristate "Normal floppy disk support"
-	depends on (!ARCH_S390 && !M68K && !IA64) || Q40 || (SUN3X && BROKEN)
+	depends on (!ARCH_S390 && !M68K && !IA64 && !USERMODE) || Q40 || (SUN3X && BROKEN)
 	---help---
 	  If you want to use the floppy disk drive(s) of your PC under Linux,
 	  say Y. Information about this driver, especially important for IBM
@@ -384,9 +384,11 @@ config INITRAMFS_SOURCE
 
 	  If you are not sure, leave it blank.
 
+#XXX - it makes sense to enable this only for 32-bit subarch's, not for x86_64
+#for instance.
 config LBD
 	bool "Support for Large Block Devices"
-	depends on X86 || MIPS32 || PPC32 || ARCH_S390_31 || SUPERH
+	depends on X86 || MIPS32 || PPC32 || ARCH_S390_31 || SUPERH || USERMODE
 	help
 	  Say Y here if you want to attach large (bigger than 2TB) discs to
 	  your machine, or if you want to have a raid or loopback device
@@ -394,6 +396,7 @@ config LBD
 
 config CDROM_PKTCDVD
 	tristate "Packet writing on CD/DVD media"
+	depends on !USERMODE
 	help
 	  If you have a CDROM drive that supports packet writing, say Y to
 	  include preliminary support. It should work with any MMC/Mt Fuji
diff -puN arch/um/Kconfig~uml-depend-out-main-block-Kconfig arch/um/Kconfig
--- linux-2.6.10-rc/arch/um/Kconfig~uml-depend-out-main-block-Kconfig	2004-12-07 07:20:37.452704152 +0100
+++ linux-2.6.10-rc-paolo/arch/um/Kconfig	2004-12-07 07:20:37.456703544 +0100
@@ -238,7 +238,7 @@ source "drivers/base/Kconfig"
 
 source "arch/um/Kconfig_char"
 
-source "arch/um/Kconfig_block"
+source "drivers/block/Kconfig"
 
 config NETDEVICES
 	bool
_

Re: [uml-devel] Re: [uml-user] Any complaints about parallel make in 2.6.10-rc?

[Blaisorblade]

[-- Attachment #1: Type: text/plain, Size: 1225 bytes --]

On Tuesday 07 December 2004 07:25, Blaisorblade wrote:
> On Tuesday 07 December 2004 06:47, Christopher S. Aker wrote:
> > > Since somebody (maybe Christopher Aker) said that parallel make was
> > > broken in 2.6.10-rc, I'm asking to report it in detail, if the
> > > complaint is correct.
> >
> > Odd.. "make ARCH=um -jN" works, but "make -jN ARCH=um" doesn't.  How did
> > I miss that?
>
> ??? Well, missing such a difference is *obvious*, since it does not make
> sense at all.
I've tested both things... and it appears I get the same problems / success 
with both things:



> I'm instead discovering a more interesting issue, due to some mainline
> updates to Kconfig, preventing Ramdisk code to build. Trivial fix attached.
> A less trivial fix, i.e. uml-depend-out-main-block-Kconfig.patch, cleaning
> things up definitely (i.e. going to drop arch/um/Kconfig_block , which is a
> selected duplicate of what's in drivers/block/Kconfig), is attached too.
In the second one, I forgot to add UBD (and COW and CONFIG_MMAPER) config 
option to drivers/block/Kconfig, so use the updated version I'm attaching.
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade

[-- Attachment #2: uml-depend-out-main-block-Kconfig.patch --]
[-- Type: text/x-diff, Size: 3930 bytes --]


Finally, we end with this the need to update arch/um/Kconfig_block with
changes in drivers/block/Kconfig.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
---

 linux-2.6.10-rc-paolo/arch/um/Kconfig       |    2 -
 linux-2.6.10-rc-paolo/drivers/block/Kconfig |   40 ++++++++++++++++++++++++++--
 2 files changed, 39 insertions(+), 3 deletions(-)

diff -puN drivers/block/Kconfig~uml-depend-out-main-block-Kconfig drivers/block/Kconfig
--- linux-2.6.10-rc/drivers/block/Kconfig~uml-depend-out-main-block-Kconfig	2004-12-07 07:35:05.993665856 +0100
+++ linux-2.6.10-rc-paolo/drivers/block/Kconfig	2004-12-07 07:35:39.037642408 +0100
@@ -6,7 +6,7 @@ menu "Block devices"
 
 config BLK_DEV_FD
 	tristate "Normal floppy disk support"
-	depends on (!ARCH_S390 && !M68K && !IA64) || Q40 || (SUN3X && BROKEN)
+	depends on (!ARCH_S390 && !M68K && !IA64 && !USERMODE) || Q40 || (SUN3X && BROKEN)
 	---help---
 	  If you want to use the floppy disk drive(s) of your PC under Linux,
 	  say Y. Information about this driver, especially important for IBM
@@ -208,6 +208,39 @@ config BLK_DEV_UMEM
 	  one is chosen dynamically.  Use "devfs" or look in /proc/devices
 	  for the device number
 
+config BLK_DEV_UBD
+	bool "Virtual block device"
+	depends on USERMODE
+	help
+          The User-Mode Linux port includes a driver called UBD which will let
+          you access arbitrary files on the host computer as block devices.
+          Unless you know that you do not need such virtual block devices say
+          Y here.
+
+config BLK_DEV_UBD_SYNC
+	bool "Always do synchronous disk IO for UBD"
+	depends on BLK_DEV_UBD
+	help
+	  Writes to the virtual block device are not immediately written to the
+	  host's disk; this may cause problems if, for example, the User-Mode
+	  Linux 'Virtual Machine' uses a journalling filesystem and the host
+	  computer crashes.
+
+          Synchronous operation (i.e. always writing data to the host's disk
+          immediately) is configurable on a per-UBD basis by using a special
+          kernel command line option.  Alternatively, you can say Y here to
+          turn on synchronous operation by default for all block devices.
+
+          If you're running a journalling file system (like reiserfs, for
+          example) in your virtual machine, you will want to say Y here.  If
+          you care for the safety of the data in your virtual machine, Y is a
+          wise choice too.  In all other cases (for example, if you're just
+          playing around with User-Mode Linux) you can choose N.
+
+config BLK_DEV_COW_COMMON
+	bool
+	default BLK_DEV_UBD
+
 config BLK_DEV_LOOP
 	tristate "Loopback device support"
 	---help---
@@ -384,9 +417,11 @@ config INITRAMFS_SOURCE
 
 	  If you are not sure, leave it blank.
 
+#XXX - it makes sense to enable this only for 32-bit subarch's, not for x86_64
+#for instance.
 config LBD
 	bool "Support for Large Block Devices"
-	depends on X86 || MIPS32 || PPC32 || ARCH_S390_31 || SUPERH
+	depends on X86 || MIPS32 || PPC32 || ARCH_S390_31 || SUPERH || USERMODE
 	help
 	  Say Y here if you want to attach large (bigger than 2TB) discs to
 	  your machine, or if you want to have a raid or loopback device
@@ -394,6 +429,7 @@ config LBD
 
 config CDROM_PKTCDVD
 	tristate "Packet writing on CD/DVD media"
+	depends on !USERMODE
 	help
 	  If you have a CDROM drive that supports packet writing, say Y to
 	  include preliminary support. It should work with any MMC/Mt Fuji
diff -puN arch/um/Kconfig~uml-depend-out-main-block-Kconfig arch/um/Kconfig
--- linux-2.6.10-rc/arch/um/Kconfig~uml-depend-out-main-block-Kconfig	2004-12-07 07:35:05.995665552 +0100
+++ linux-2.6.10-rc-paolo/arch/um/Kconfig	2004-12-07 07:35:05.999664944 +0100
@@ -238,7 +238,7 @@ source "drivers/base/Kconfig"
 
 source "arch/um/Kconfig_char"
 
-source "arch/um/Kconfig_block"
+source "drivers/block/Kconfig"
 
 config NETDEVICES
 	bool
_