[PATCH] pthread_create.3: re-do the architecture/default stack size mapping

[PATCH] pthread_create.3: re-do the architecture/default stack size mapping

[наб]

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Currently, the page lists 2 of the 3 x86 architectures, no ARM(!),
old PowerPC only, and most egregiously itanium,
which linux doesn't target.

Per glibc 2.38:
  $ git grep ARCH_STACK_DEFAULT_SIZE
  aarch64     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  arc         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  arm         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  csky        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  loongarch   #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  m68k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  microblaze  #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  mips        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  nios2       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  or1k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  riscv       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  s390        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  sh          #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  sparc32     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  x86         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)

  alpha       #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
  powerpc     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
  sparc64     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)

  hppa        #define ARCH_STACK_DEFAULT_SIZE  (8 * 1024 * 1024)

  ia64        #define ARCH_STACK_DEFAULT_SIZE (32 * 1024 * 1024)

I cut PA-RISC and the Alpha. They have 10 and 6 popcon entries,
respectively, and AFAICT they haven't seen a processor released
in over a decade ‒ they aren't relevant to any modern reader.

Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
---
 man3/pthread_create.3 | 19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/man3/pthread_create.3 b/man3/pthread_create.3
index 66c67a6ff..fd6253bf4 100644
--- a/man3/pthread_create.3
+++ b/man3/pthread_create.3
@@ -200,23 +200,8 @@ .SH NOTES
 If the
 .B RLIMIT_STACK
 resource limit is set to "unlimited",
-a per-architecture value is used for the stack size.
-Here is the value for a few architectures:
-.RS
-.TS
-allbox;
-lb lb
-l r.
-Architecture	Default stack size
-i386	2 MB
-IA-64	32 MB
-PowerPC	4 MB
-S/390	2 MB
-Sparc-32	2 MB
-Sparc-64	4 MB
-x86_64	2 MB
-.TE
-.RE
+a per-architecture value is used for the stack size:
+2 MB on most architectures; 4 MB on POWER and Sparc-64.
 .SH BUGS
 In the obsolete LinuxThreads implementation,
 each of the threads in a process has a different process ID.
-- 
2.39.2

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Re: [PATCH] pthread_create.3: re-do the architecture/default stack size mapping

[Alejandro Colomar]

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Hi наб,

On Thu, Feb 08, 2024 at 09:43:21PM +0100, наб wrote:
> Currently, the page lists 2 of the 3 x86 architectures, no ARM(!),
> old PowerPC only, and most egregiously itanium,
> which linux doesn't target.
> 
> Per glibc 2.38:
>   $ git grep ARCH_STACK_DEFAULT_SIZE
>   aarch64     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   arc         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   arm         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   csky        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   loongarch   #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   m68k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   microblaze  #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   mips        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   nios2       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   or1k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   riscv       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   s390        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   sh          #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   sparc32     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   x86         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
> 
>   alpha       #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
>   powerpc     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
>   sparc64     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
> 
>   hppa        #define ARCH_STACK_DEFAULT_SIZE  (8 * 1024 * 1024)
> 
>   ia64        #define ARCH_STACK_DEFAULT_SIZE (32 * 1024 * 1024)
> 
> I cut PA-RISC and the Alpha. They have 10 and 6 popcon entries,
> respectively, and AFAICT they haven't seen a processor released
> in over a decade ‒ they aren't relevant to any modern reader.
> 
> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
> ---
>  man3/pthread_create.3 | 19 ++-----------------
>  1 file changed, 2 insertions(+), 17 deletions(-)
> 
> diff --git a/man3/pthread_create.3 b/man3/pthread_create.3
> index 66c67a6ff..fd6253bf4 100644
> --- a/man3/pthread_create.3
> +++ b/man3/pthread_create.3
> @@ -200,23 +200,8 @@ .SH NOTES
>  If the
>  .B RLIMIT_STACK
>  resource limit is set to "unlimited",
> -a per-architecture value is used for the stack size.
> -Here is the value for a few architectures:
> -.RS
> -.TS
> -allbox;
> -lb lb
> -l r.
> -Architecture	Default stack size
> -i386	2 MB
> -IA-64	32 MB
> -PowerPC	4 MB
> -S/390	2 MB
> -Sparc-32	2 MB
> -Sparc-64	4 MB
> -x86_64	2 MB
> -.TE
> -.RE
> +a per-architecture value is used for the stack size:
> +2 MB on most architectures; 4 MB on POWER and Sparc-64.

Why capitalize POWER and omit PC?  Other than that, LGTM.

Thanks for the patch.

Have a lovely day!
Alex

>  .SH BUGS
>  In the obsolete LinuxThreads implementation,
>  each of the threads in a process has a different process ID.
> -- 
> 2.39.2



-- 
<https://www.alejandro-colomar.es/>
Looking for a remote C programming job at the moment.

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Re: [PATCH] pthread_create.3: re-do the architecture/default stack size mapping

[наб]

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Hi!

On Sun, Feb 11, 2024 at 07:56:39PM +0100, Alejandro Colomar wrote:
> On Thu, Feb 08, 2024 at 09:43:21PM +0100, наб wrote:
> > +a per-architecture value is used for the stack size:
> > +2 MB on most architectures; 4 MB on POWER and Sparc-64.
> Why capitalize POWER and omit PC?  Other than that, LGTM.
This is what the official nomenclature seems to be:
  https://wiki.debian.org/ppc64el says
  > News
  > 
  > The IBM POWER platform, code name ppc64el, is an official architecture since
  > DebianJessie.
  > 
  > Required Hardware
  > 
  > Debian/ppc64el requires, at minimum, a POWER8 processor machine. Although
  > Debian was initially bootstrapped on a POWER7 set of servers, this class of
  > server is not supported anymore, and you are not able to run Debian/ppc64el
  > on a POWER 7 processor without hitting an illegal instruction fault.
  > 
  > There are, at this moment, a plenty of POWER8 machines being sold by
  > different companies. 

All the branding I've ever seen in the modern world calls it POWER,
and AIUI the PowerPC branding was abandoned like 15 years ago.

The debian wiki page even says
  > The ppc64el port is not aimed for old Powerpc Macintosh machines,
  > and, at the moment, there is no way to install it on this class of
  > machines.
but wikipedia tells me the last product from this line came out in 2006,
which is pushing two decades by now. Even then, apparently
"PowerPC is largely based on the earlier IBM POWER architecture"
so it's the same thing.

Maybe when Apple had a choke-hold on the millennial mind a calling it
"PowerPC" could've made sense, but through a modern lens PowerPC,
to the extent it exists at all, is just a derivative of POWER I think

Best,

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Re: [PATCH] pthread_create.3: re-do the architecture/default stack size mapping

[Alejandro Colomar]

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Hi!,

On Sun, Feb 11, 2024 at 09:00:04PM +0100, наб wrote:
> Hi!
> 
> On Sun, Feb 11, 2024 at 07:56:39PM +0100, Alejandro Colomar wrote:
> > On Thu, Feb 08, 2024 at 09:43:21PM +0100, наб wrote:
> > > +a per-architecture value is used for the stack size:
> > > +2 MB on most architectures; 4 MB on POWER and Sparc-64.
> > Why capitalize POWER and omit PC?  Other than that, LGTM.
> This is what the official nomenclature seems to be:
>   https://wiki.debian.org/ppc64el says
>   > News
>   > 
>   > The IBM POWER platform, code name ppc64el, is an official architecture since
>   > DebianJessie.
>   > 
>   > Required Hardware
>   > 
>   > Debian/ppc64el requires, at minimum, a POWER8 processor machine. Although
>   > Debian was initially bootstrapped on a POWER7 set of servers, this class of
>   > server is not supported anymore, and you are not able to run Debian/ppc64el
>   > on a POWER 7 processor without hitting an illegal instruction fault.
>   > 
>   > There are, at this moment, a plenty of POWER8 machines being sold by
>   > different companies. 
> 
> All the branding I've ever seen in the modern world calls it POWER,
> and AIUI the PowerPC branding was abandoned like 15 years ago.
> 
> The debian wiki page even says
>   > The ppc64el port is not aimed for old Powerpc Macintosh machines,
>   > and, at the moment, there is no way to install it on this class of
>   > machines.
> but wikipedia tells me the last product from this line came out in 2006,
> which is pushing two decades by now. Even then, apparently
> "PowerPC is largely based on the earlier IBM POWER architecture"
> so it's the same thing.
> 
> Maybe when Apple had a choke-hold on the millennial mind a calling it
> "PowerPC" could've made sense, but through a modern lens PowerPC,
> to the extent it exists at all, is just a derivative of POWER I think
> 
> Best,

Hmmm, thanks!  Could you include this (or an excerpt if you prefer) in
the commit message, since we're changing the nomenclature?

Have a lovely night!
Alex

-- 
<https://www.alejandro-colomar.es/>
Looking for a remote C programming job at the moment.

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[PATCH v2] pthread_create.3: re-do the architecture/default stack size mapping

[наб]

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Currently, the page lists 2 of the 3 x86 architectures, no ARM(!),
old PowerPC only, and most egregiously itanium,
which linux doesn't target.

Per glibc 2.38:
  $ git grep ARCH_STACK_DEFAULT_SIZE
  aarch64     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  arc         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  arm         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  csky        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  loongarch   #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  m68k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  microblaze  #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  mips        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  nios2       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  or1k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  riscv       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  s390        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  sh          #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  sparc32     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  x86         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)

  alpha       #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
  powerpc     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
  sparc64     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)

  hppa        #define ARCH_STACK_DEFAULT_SIZE  (8 * 1024 * 1024)

  ia64        #define ARCH_STACK_DEFAULT_SIZE (32 * 1024 * 1024)

I cut PA-RISC and the Alpha. They have 10 and 6 popcon entries,
respectively, and AFAICT they haven't seen a processor released
in over a decade, they aren't relevant to any modern reader.

Similarly, use "POWER" instead of "PowerPC" ‒ the consensus branding
is "POWER"+version (POWER8/POWER9); PowerPC is itself a POWER variant
and doesn't really deserve its own special mention, especially in 2024.

Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
---
 man3/pthread_create.3 | 19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/man3/pthread_create.3 b/man3/pthread_create.3
index 66c67a6ff..fd6253bf4 100644
--- a/man3/pthread_create.3
+++ b/man3/pthread_create.3
@@ -200,23 +200,8 @@ .SH NOTES
 If the
 .B RLIMIT_STACK
 resource limit is set to "unlimited",
-a per-architecture value is used for the stack size.
-Here is the value for a few architectures:
-.RS
-.TS
-allbox;
-lb lb
-l r.
-Architecture	Default stack size
-i386	2 MB
-IA-64	32 MB
-PowerPC	4 MB
-S/390	2 MB
-Sparc-32	2 MB
-Sparc-64	4 MB
-x86_64	2 MB
-.TE
-.RE
+a per-architecture value is used for the stack size:
+2 MB on most architectures; 4 MB on POWER and Sparc-64.
 .SH BUGS
 In the obsolete LinuxThreads implementation,
 each of the threads in a process has a different process ID.
-- 
2.39.2

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Re: [PATCH v2] pthread_create.3: re-do the architecture/default stack size mapping

[Alejandro Colomar]

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Hi наб,

On Sun, Feb 11, 2024 at 11:27:46PM +0100, наб wrote:
> Currently, the page lists 2 of the 3 x86 architectures, no ARM(!),
> old PowerPC only, and most egregiously itanium,
> which linux doesn't target.
> 
> Per glibc 2.38:
>   $ git grep ARCH_STACK_DEFAULT_SIZE
>   aarch64     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   arc         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   arm         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   csky        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   loongarch   #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   m68k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   microblaze  #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   mips        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   nios2       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   or1k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   riscv       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   s390        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   sh          #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   sparc32     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
>   x86         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
> 
>   alpha       #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
>   powerpc     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
>   sparc64     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
> 
>   hppa        #define ARCH_STACK_DEFAULT_SIZE  (8 * 1024 * 1024)
> 
>   ia64        #define ARCH_STACK_DEFAULT_SIZE (32 * 1024 * 1024)
> 
> I cut PA-RISC and the Alpha. They have 10 and 6 popcon entries,
> respectively, and AFAICT they haven't seen a processor released
> in over a decade, they aren't relevant to any modern reader.
> 
> Similarly, use "POWER" instead of "PowerPC" ‒ the consensus branding
> is "POWER"+version (POWER8/POWER9); PowerPC is itself a POWER variant
> and doesn't really deserve its own special mention, especially in 2024.
> 
> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>

Patch applied.  Thanks.

Have a lovely night!
Alex

> ---
>  man3/pthread_create.3 | 19 ++-----------------
>  1 file changed, 2 insertions(+), 17 deletions(-)
> 
> diff --git a/man3/pthread_create.3 b/man3/pthread_create.3
> index 66c67a6ff..fd6253bf4 100644
> --- a/man3/pthread_create.3
> +++ b/man3/pthread_create.3
> @@ -200,23 +200,8 @@ .SH NOTES
>  If the
>  .B RLIMIT_STACK
>  resource limit is set to "unlimited",
> -a per-architecture value is used for the stack size.
> -Here is the value for a few architectures:
> -.RS
> -.TS
> -allbox;
> -lb lb
> -l r.
> -Architecture	Default stack size
> -i386	2 MB
> -IA-64	32 MB
> -PowerPC	4 MB
> -S/390	2 MB
> -Sparc-32	2 MB
> -Sparc-64	4 MB
> -x86_64	2 MB
> -.TE
> -.RE
> +a per-architecture value is used for the stack size:
> +2 MB on most architectures; 4 MB on POWER and Sparc-64.
>  .SH BUGS
>  In the obsolete LinuxThreads implementation,
>  each of the threads in a process has a different process ID.
> -- 
> 2.39.2



-- 
<https://www.alejandro-colomar.es/>
Looking for a remote C programming job at the moment.

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