Re: how to look for source code in kernel

Re: how to look for source code in kernel

[anish singh]

On Fri, Dec 28, 2012 at 1:23 AM, Henrique Rodrigues
<henriquesilvar@gmail.com> wrote:
> http://lxr.linux.no/ is a really good linux cross referencing website for
> code reference.
>
> On Thu, Dec 27, 2012 at 10:40 AM, Jonathan Neuschäfer
> <j.neuschaefer@gmx.net> wrote:
>>
>> On Thu, Dec 27, 2012 at 11:01:52PM +0530, kishore kumar wrote:
>> > can anybody tell me how to look into source code, as most are hidden in
>> > kernel.
>>
>> You can find the Linux source code at http://kernel.org/ .
for browsing the code unfortunately there is no good tool as in windows we
have source insight.We can use wine in linux but that sucks.
>>
>> HTH,
>> Jonathan Neuschäfer
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies@kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
>
>
> --
> Henrique Rodrigues
> http://www.dcc.ufmg.br/~hsr
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies@kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>

Re: how to look for source code in kernel

[amit mehta]

>>> On Thu, Dec 27, 2012 at 11:01:52PM +0530, kishore kumar wrote:
>>> > can anybody tell me how to look into source code, as most are hidden in
>>> > kernel.
>>>
>>> You can find the Linux source code at http://kernel.org/ .
> for browsing the code unfortunately there is no good tool as in windows we
> have source insight.We can use wine in linux but that sucks.
Funny you say that!
Never heard of cscope, ctags ?

-Amit

Re: how to look for source code in kernel

[anish singh]

On Fri, Dec 28, 2012 at 10:42 AM, amit mehta <gmate.amit@gmail.com> wrote:
>>>> On Thu, Dec 27, 2012 at 11:01:52PM +0530, kishore kumar wrote:
>>>> > can anybody tell me how to look into source code, as most are hidden in
>>>> > kernel.
>>>>
>>>> You can find the Linux source code at http://kernel.org/ .
>> for browsing the code unfortunately there is no good tool as in windows we
>> have source insight.We can use wine in linux but that sucks.
> Funny you say that!
> Never heard of cscope, ctags ?
It is not as convenient as source insight or is it?
>
> -Amit

Re: how to look for source code in kernel

[Alex Belits]

On Fri, 28 Dec 2012, anish singh wrote:

>>> have source insight.We can use wine in linux but that sucks.
>> Funny you say that!
>> Never heard of cscope, ctags ?
> It is not as convenient as source insight or is it?

There is also LXR.

If it's not good enough for you, then don't look at it.

Re: how to look for source code in kernel

[Chen Gang F T]

[-- Attachment #1: Type: text/plain, Size: 1304 bytes --]

于 2012年12月28日 13:12, amit mehta 写道:
>>>> On Thu, Dec 27, 2012 at 11:01:52PM +0530, kishore kumar wrote:
>>>>> can anybody tell me how to look into source code, as most are hidden in
>>>>> kernel.
>>>> You can find the Linux source code at http://kernel.org/ .
>> for browsing the code unfortunately there is no good tool as in windows we
>> have source insight.We can use wine in linux but that sucks.
> Funny you say that!
> Never heard of cscope, ctags ?

  at least for me:
     vi (or vim) with another command line tools (grep, wc...) are enough.

     for reading or editing source code: grasp one editor is enough.
       I originally work under Windows OS
          using VC IDE and source insight for many years (at least 6 years).
       but I never feel they are better than vi, and neither less than vi.
       each editor has its own efficiency using ways, 
         what we need do is to grasp it.

    when you grasp the editor (no matter what it is), it will be enough for you.

    

>
> -Amit
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/


-- 
Flying Transformer


[-- Attachment #2: chen_gang_flying_transformer.vcf --]
[-- Type: text/x-vcard, Size: 67 bytes --]

begin:vcard
fn:Chen Gang
n:;Chen Gang
version:2.1
end:vcard

Re: how to look for source code in kernel

[Chen Gang F T]

[-- Attachment #1: Type: text/plain, Size: 1302 bytes --]

于 2012年12月28日 13:12, amit mehta 写道:
>>>> On Thu, Dec 27, 2012 at 11:01:52PM +0530, kishore kumar wrote:
>>>>> can anybody tell me how to look into source code, as most are hidden in
>>>>> kernel.
>>>> You can find the Linux source code at http://kernel.org/ .
>> for browsing the code unfortunately there is no good tool as in windows we
>> have source insight.We can use wine in linux but that sucks.
> Funny you say that!
> Never heard of cscope, ctags ?

  at least for me:
     vi (or vim) with another command line tools (grep, wc...) are enough.

     for reading or editing source code: grasp one editor is enough.
       I originally work under Windows OS,
         using VC IDE and source insight for many years (at least 6 years).
       but I never feel they are better than vi, and neither less than vi.
       each editor has its own efficiency using ways,
         what we need do is to grasp it.

    when you grasp the editor (no matter what it is), it will be enough for you.

    


> -Amit
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/


-- 
Flying Transformer


[-- Attachment #2: chen_gang_flying_transformer.vcf --]
[-- Type: text/x-vcard, Size: 67 bytes --]

begin:vcard
fn:Chen Gang
n:;Chen Gang
version:2.1
end:vcard

Re: how to look for source code in kernel

[Eric W. Biederman]

anish singh <anish198519851985@gmail.com> writes:

> On Fri, Dec 28, 2012 at 10:42 AM, amit mehta <gmate.amit@gmail.com> wrote:
>>>>> On Thu, Dec 27, 2012 at 11:01:52PM +0530, kishore kumar wrote:
>>>>> > can anybody tell me how to look into source code, as most are hidden in
>>>>> > kernel.
>>>>>
>>>>> You can find the Linux source code at http://kernel.org/ .
>>> for browsing the code unfortunately there is no good tool as in windows we
>>> have source insight.We can use wine in linux but that sucks.
>> Funny you say that!
>> Never heard of cscope, ctags ?
> It is not as convenient as source insight or is it?

I took a look and source insite seems to have a whole lot of
inconvinient mousing around.  A setup where you get to stay on your home
keys seems much more convinient to me.

But then I am probably peculiar keeping an index of the source code in
my head.  When I need to look for something and I don't know where to
find it I do.

git-ls-files | xargs fgrep 'struct f2fs_inode'

That returns instantly and tells me where to look.  If you can do an
instant brute force search what is the point of an index?

My experience with gui editors is that they always hide something I need
to see, or my code is just strange enough (say having asm file, or
supporting multiple architectures) that the tools get horribly confused.

So I suspect source insight would be terribly inconvinient to the point
of uselessness to me.

Eric

Re: how to look for source code in kernel

[Borislav Petkov]

On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
> git-ls-files | xargs fgrep 'struct f2fs_inode'
> 
> That returns instantly and tells me where to look.  If you can do an
> instant brute force search what is the point of an index?

Not if you're using a lame-ass laptop with a rotating disk:

$ time git ls-files | xargs grep -E 'struct mce\W*{'
arch/x86/include/uapi/asm/mce.h:struct mce {
arch/x86/kernel/cpu/mcheck/mce.c:               if (!final || memcmp(m, final, sizeof(struct mce))) {

real    2m48.415s
user    0m2.388s
sys     0m15.668s

What I've grown accustomed to is cscope with a prior find run on the
kernel source tree to create a custom cscope.files which cscope uses to
index and then using vim bindings in cscope so that if, for example, the
cursor is on a function call, executing a keyboard shortcut opens the
definition of that function in another vim tab. I.e., a thin IDE done
right.

> My experience with gui editors is that they always hide something I
> need to see, or my code is just strange enough (say having asm file,
> or supporting multiple architectures) that the tools get horribly
> confused.

That's true, then I tend to use another xterm with tabbed vim showing
additional files. Btw, git ls-files assumes a source file is tracked by
git and in the seldom case where you're adding new, yet untracked files,
that won't work.

So probably a mixed approach of cscope in one window and grep + editor
in another would cover all bases. For a newbie who wants to only browse
the code, cscope should be enough for starters, I'd say.

Thanks.

-- 
Regards/Gruss,
Boris.

Re: how to look for source code in kernel

[Al Viro]

On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
> But then I am probably peculiar keeping an index of the source code in
> my head.  When I need to look for something and I don't know where to
> find it I do.
> 
> git-ls-files | xargs fgrep 'struct f2fs_inode'

What's wrong with git grep?

Re: how to look for source code in kernel

[Eric W. Biederman]

Al Viro <viro@ZenIV.linux.org.uk> writes:

> On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
>> But then I am probably peculiar keeping an index of the source code in
>> my head.  When I need to look for something and I don't know where to
>> find it I do.
>> 
>> git-ls-files | xargs fgrep 'struct f2fs_inode'
>
> What's wrong with git grep?

I haven't learned it yet.  git-ls-files is a lot better than find
speed wise so is very much worth doing.    I haven't a clue if
there is an advantage to git-grep, over just knowing find, xargs, and
grep.

Eric

Re: how to look for source code in kernel

[Jonathan Neuschäfer]

On Fri, Dec 28, 2012 at 11:49:53AM -0800, Eric W. Biederman wrote:
> Al Viro <viro@ZenIV.linux.org.uk> writes:
> 
> > On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
> >> But then I am probably peculiar keeping an index of the source code in
> >> my head.  When I need to look for something and I don't know where to
> >> find it I do.
> >> 
> >> git-ls-files | xargs fgrep 'struct f2fs_inode'
> >
> > What's wrong with git grep?
> 
> I haven't learned it yet.  git-ls-files is a lot better than find
> speed wise so is very much worth doing.    I haven't a clue if
> there is an advantage to git-grep, over just knowing find, xargs, and
> grep.

Brevity.

Jonathan

Re: how to look for source code in kernel

[Joe Perches]

On Fri, 2012-12-28 at 16:09 +0000, Al Viro wrote:
> On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
> > But then I am probably peculiar keeping an index of the source code in
> > my head.  When I need to look for something and I don't know where to
> > find it I do.
> > 
> > git-ls-files | xargs fgrep 'struct f2fs_inode'
> 
> What's wrong with git grep?

Positive: it loads multiple cpus with very little file I/O
Negative: it doesn't use -P very well.
          it won't spans lines like:

	struct name
	{

with git grep -P "\bstruct\s+\w+\s*{"

(the last grep that does I believe is 2.54)

Re: how to look for source code in kernel

[Geert Uytterhoeven]

On Fri, Dec 28, 2012 at 2:07 PM, Borislav Petkov <bp@alien8.de> wrote:
> On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
>> git-ls-files | xargs fgrep 'struct f2fs_inode'
>>
>> That returns instantly and tells me where to look.  If you can do an
>> instant brute force search what is the point of an index?
>
> Not if you're using a lame-ass laptop with a rotating disk:
>
> $ time git ls-files | xargs grep -E 'struct mce\W*{'
> arch/x86/include/uapi/asm/mce.h:struct mce {
> arch/x86/kernel/cpu/mcheck/mce.c:               if (!final || memcmp(m, final, sizeof(struct mce))) {
>
> real    2m48.415s
> user    0m2.388s
> sys     0m15.668s

That's the first run. Now everything is in the buffer cache (assumed you have
enough RAM), and try again...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: how to look for source code in kernel

[Guennadi Liakhovetski]

On Fri, 28 Dec 2012, Borislav Petkov wrote:

> On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
> > git-ls-files | xargs fgrep 'struct f2fs_inode'
> > 
> > That returns instantly and tells me where to look.  If you can do an
> > instant brute force search what is the point of an index?
> 
> Not if you're using a lame-ass laptop with a rotating disk:
> 
> $ time git ls-files | xargs grep -E 'struct mce\W*{'
> arch/x86/include/uapi/asm/mce.h:struct mce {
> arch/x86/kernel/cpu/mcheck/mce.c:               if (!final || memcmp(m, final, sizeof(struct mce))) {
> 
> real    2m48.415s
> user    0m2.388s
> sys     0m15.668s
> 
> What I've grown accustomed to is cscope with a prior find run on the
> kernel source tree to create a custom cscope.files which cscope uses to
> index and then using vim bindings in cscope so that if, for example, the
> cursor is on a function call, executing a keyboard shortcut opens the
> definition of that function in another vim tab. I.e., a thin IDE done
> right.

...same works with TAGS under emacs, the only annoying problem with it 
since "recently" (about half a year or more) is that "make TAGS" is 
spewing out tons of

etags: Unmatched ( or \( while compiling pattern

oh well, looks like noone is using it / noone cares enough...

Thanks
Guennadi

> 
> > My experience with gui editors is that they always hide something I
> > need to see, or my code is just strange enough (say having asm file,
> > or supporting multiple architectures) that the tools get horribly
> > confused.
> 
> That's true, then I tend to use another xterm with tabbed vim showing
> additional files. Btw, git ls-files assumes a source file is tracked by
> git and in the seldom case where you're adding new, yet untracked files,
> that won't work.
> 
> So probably a mixed approach of cscope in one window and grep + editor
> in another would cover all bases. For a newbie who wants to only browse
> the code, cscope should be enough for starters, I'd say.
> 
> Thanks.
> 
> -- 
> Regards/Gruss,
> Boris.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/

Re: how to look for source code in kernel

[Jesper Juhl]

On Fri, 28 Dec 2012, Guennadi Liakhovetski wrote:

> On Fri, 28 Dec 2012, Borislav Petkov wrote:
> 
> > On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
> > > git-ls-files | xargs fgrep 'struct f2fs_inode'
> > > 
> > > That returns instantly and tells me where to look.  If you can do an
> > > instant brute force search what is the point of an index?
> > 
> > Not if you're using a lame-ass laptop with a rotating disk:
> > 
> > $ time git ls-files | xargs grep -E 'struct mce\W*{'
> > arch/x86/include/uapi/asm/mce.h:struct mce {
> > arch/x86/kernel/cpu/mcheck/mce.c:               if (!final || memcmp(m, final, sizeof(struct mce))) {
> > 
> > real    2m48.415s
> > user    0m2.388s
> > sys     0m15.668s
> > 
> > What I've grown accustomed to is cscope with a prior find run on the
> > kernel source tree to create a custom cscope.files which cscope uses to
> > index and then using vim bindings in cscope so that if, for example, the
> > cursor is on a function call, executing a keyboard shortcut opens the
> > definition of that function in another vim tab. I.e., a thin IDE done
> > right.
> 
> ...same works with TAGS under emacs, the only annoying problem with it 
> since "recently" (about half a year or more) is that "make TAGS" is 
> spewing out tons of
> 
> etags: Unmatched ( or \( while compiling pattern
> 
> oh well, looks like noone is using it / noone cares enough...
> 
I use it. I haven't bothered (yet) to look into the cause of the message 
it spews since the etags ('TAGS') file it produces still seems to work 
well enough.

-- 
Jesper Juhl <jj@chaosbits.net>       http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
Plain text mails only, please.

[PATCH] scripts/tags.sh: Fix regex syntax for etags

[Andreas Schwab]

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
---
 scripts/tags.sh | 50 +++++++++++++++++++++++++-------------------------
 1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/scripts/tags.sh b/scripts/tags.sh
index 08f06c0..4c53b7d 100755
--- a/scripts/tags.sh
+++ b/scripts/tags.sh
@@ -201,34 +201,34 @@ exuberant()
 emacs()
 {
 	all_target_sources | xargs $1 -a                        \
-	--regex='/^(ENTRY|_GLOBAL)(\([^)]*\)).*/\2/'            \
+	--regex='/^\(ENTRY\|_GLOBAL\)(\([^)]*\)).*/\2/'         \
 	--regex='/^SYSCALL_DEFINE[0-9]?(\([^,)]*\).*/sys_\1/'   \
 	--regex='/^TRACE_EVENT(\([^,)]*\).*/trace_\1/'		\
 	--regex='/^DEFINE_EVENT([^,)]*, *\([^,)]*\).*/trace_\1/' \
-	--regex='/PAGEFLAG\(([^,)]*).*/Page\1/'			\
-	--regex='/PAGEFLAG\(([^,)]*).*/SetPage\1/'		\
-	--regex='/PAGEFLAG\(([^,)]*).*/ClearPage\1/'		\
-	--regex='/TESTSETFLAG\(([^,)]*).*/TestSetPage\1/'	\
-	--regex='/TESTPAGEFLAG\(([^,)]*).*/Page\1/'		\
-	--regex='/SETPAGEFLAG\(([^,)]*).*/SetPage\1/'		\
-	--regex='/__SETPAGEFLAG\(([^,)]*).*/__SetPage\1/'	\
-	--regex='/TESTCLEARFLAG\(([^,)]*).*/TestClearPage\1/'	\
-	--regex='/__TESTCLEARFLAG\(([^,)]*).*/TestClearPage\1/'	\
-	--regex='/CLEARPAGEFLAG\(([^,)]*).*/ClearPage\1/'	\
-	--regex='/__CLEARPAGEFLAG\(([^,)]*).*/__ClearPage\1/'	\
-	--regex='/__PAGEFLAG\(([^,)]*).*/__SetPage\1/'		\
-	--regex='/__PAGEFLAG\(([^,)]*).*/__ClearPage\1/'	\
-	--regex='/PAGEFLAG_FALSE\(([^,)]*).*/Page\1/'		\
-	--regex='/TESTSCFLAG\(([^,)]*).*/TestSetPage\1/'	\
-	--regex='/TESTSCFLAG\(([^,)]*).*/TestClearPage\1/'	\
-	--regex='/SETPAGEFLAG_NOOP\(([^,)]*).*/SetPage\1/'	\
-	--regex='/CLEARPAGEFLAG_NOOP\(([^,)]*).*/ClearPage\1/'	\
-	--regex='/__CLEARPAGEFLAG_NOOP\(([^,)]*).*/__ClearPage\1/' \
-	--regex='/TESTCLEARFLAG_FALSE\(([^,)]*).*/TestClearPage\1/' \
-	--regex='/__TESTCLEARFLAG_FALSE\(([^,)]*).*/__TestClearPage\1/' \
-	--regex='/_PE\(([^,)]*).*/PEVENT_ERRNO__\1/'		\
-	--regex='/PCI_OP_READ\(([a-z]*[a-z]).*[1-4]\)/pci_bus_read_config_\1/' \
-	--regex='/PCI_OP_WRITE\(([a-z]*[a-z]).*[1-4]\)/pci_bus_write_config_\1/'
+	--regex='/PAGEFLAG(\([^,)]*\).*/Page\1/'			\
+	--regex='/PAGEFLAG(\([^,)]*\).*/SetPage\1/'		\
+	--regex='/PAGEFLAG(\([^,)]*\).*/ClearPage\1/'		\
+	--regex='/TESTSETFLAG(\([^,)]*\).*/TestSetPage\1/'	\
+	--regex='/TESTPAGEFLAG(\([^,)]*\).*/Page\1/'		\
+	--regex='/SETPAGEFLAG(\([^,)]*\).*/SetPage\1/'		\
+	--regex='/__SETPAGEFLAG(\([^,)]*\).*/__SetPage\1/'	\
+	--regex='/TESTCLEARFLAG(\([^,)]*\).*/TestClearPage\1/'	\
+	--regex='/__TESTCLEARFLAG(\([^,)]*\).*/TestClearPage\1/'	\
+	--regex='/CLEARPAGEFLAG(\([^,)]*\).*/ClearPage\1/'	\
+	--regex='/__CLEARPAGEFLAG(\([^,)]*\).*/__ClearPage\1/'	\
+	--regex='/__PAGEFLAG(\([^,)]*\).*/__SetPage\1/'		\
+	--regex='/__PAGEFLAG(\([^,)]*\).*/__ClearPage\1/'	\
+	--regex='/PAGEFLAG_FALSE(\([^,)]*\).*/Page\1/'		\
+	--regex='/TESTSCFLAG(\([^,)]*\).*/TestSetPage\1/'	\
+	--regex='/TESTSCFLAG(\([^,)]*\).*/TestClearPage\1/'	\
+	--regex='/SETPAGEFLAG_NOOP(\([^,)]*\).*/SetPage\1/'	\
+	--regex='/CLEARPAGEFLAG_NOOP(\([^,)]*\).*/ClearPage\1/'	\
+	--regex='/__CLEARPAGEFLAG_NOOP(\([^,)]*\).*/__ClearPage\1/' \
+	--regex='/TESTCLEARFLAG_FALSE(\([^,)]*\).*/TestClearPage\1/' \
+	--regex='/__TESTCLEARFLAG_FALSE(\([^,)]*\).*/__TestClearPage\1/' \
+	--regex='/_PE(\([^,)]*\).*/PEVENT_ERRNO__\1/'		\
+	--regex='/PCI_OP_READ(\([a-z]*[a-z]\).*[1-4])/pci_bus_read_config_\1/' \
+	--regex='/PCI_OP_WRITE(\([a-z]*[a-z]\).*[1-4])/pci_bus_write_config_\1/'
 
 	all_kconfigs | xargs $1 -a                              \
 	--regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'
-- 
1.8.0.3


-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: [PATCH] scripts/tags.sh: Fix regex syntax for etags

[Jesper Juhl]

On Sat, 29 Dec 2012, Andreas Schwab wrote:

> Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
> ---
>  scripts/tags.sh | 50 +++++++++++++++++++++++++-------------------------
>  1 file changed, 25 insertions(+), 25 deletions(-)
> 
> diff --git a/scripts/tags.sh b/scripts/tags.sh
> index 08f06c0..4c53b7d 100755
> --- a/scripts/tags.sh
> +++ b/scripts/tags.sh
> @@ -201,34 +201,34 @@ exuberant()
>  emacs()
>  {
>  	all_target_sources | xargs $1 -a                        \
> -	--regex='/^(ENTRY|_GLOBAL)(\([^)]*\)).*/\2/'            \
> +	--regex='/^\(ENTRY\|_GLOBAL\)(\([^)]*\)).*/\2/'         \
>  	--regex='/^SYSCALL_DEFINE[0-9]?(\([^,)]*\).*/sys_\1/'   \
>  	--regex='/^TRACE_EVENT(\([^,)]*\).*/trace_\1/'		\
>  	--regex='/^DEFINE_EVENT([^,)]*, *\([^,)]*\).*/trace_\1/' \
> -	--regex='/PAGEFLAG\(([^,)]*).*/Page\1/'			\
> -	--regex='/PAGEFLAG\(([^,)]*).*/SetPage\1/'		\
> -	--regex='/PAGEFLAG\(([^,)]*).*/ClearPage\1/'		\
> -	--regex='/TESTSETFLAG\(([^,)]*).*/TestSetPage\1/'	\
> -	--regex='/TESTPAGEFLAG\(([^,)]*).*/Page\1/'		\
> -	--regex='/SETPAGEFLAG\(([^,)]*).*/SetPage\1/'		\
> -	--regex='/__SETPAGEFLAG\(([^,)]*).*/__SetPage\1/'	\
> -	--regex='/TESTCLEARFLAG\(([^,)]*).*/TestClearPage\1/'	\
> -	--regex='/__TESTCLEARFLAG\(([^,)]*).*/TestClearPage\1/'	\
> -	--regex='/CLEARPAGEFLAG\(([^,)]*).*/ClearPage\1/'	\
> -	--regex='/__CLEARPAGEFLAG\(([^,)]*).*/__ClearPage\1/'	\
> -	--regex='/__PAGEFLAG\(([^,)]*).*/__SetPage\1/'		\
> -	--regex='/__PAGEFLAG\(([^,)]*).*/__ClearPage\1/'	\
> -	--regex='/PAGEFLAG_FALSE\(([^,)]*).*/Page\1/'		\
> -	--regex='/TESTSCFLAG\(([^,)]*).*/TestSetPage\1/'	\
> -	--regex='/TESTSCFLAG\(([^,)]*).*/TestClearPage\1/'	\
> -	--regex='/SETPAGEFLAG_NOOP\(([^,)]*).*/SetPage\1/'	\
> -	--regex='/CLEARPAGEFLAG_NOOP\(([^,)]*).*/ClearPage\1/'	\
> -	--regex='/__CLEARPAGEFLAG_NOOP\(([^,)]*).*/__ClearPage\1/' \
> -	--regex='/TESTCLEARFLAG_FALSE\(([^,)]*).*/TestClearPage\1/' \
> -	--regex='/__TESTCLEARFLAG_FALSE\(([^,)]*).*/__TestClearPage\1/' \
> -	--regex='/_PE\(([^,)]*).*/PEVENT_ERRNO__\1/'		\
> -	--regex='/PCI_OP_READ\(([a-z]*[a-z]).*[1-4]\)/pci_bus_read_config_\1/' \
> -	--regex='/PCI_OP_WRITE\(([a-z]*[a-z]).*[1-4]\)/pci_bus_write_config_\1/'
> +	--regex='/PAGEFLAG(\([^,)]*\).*/Page\1/'			\
> +	--regex='/PAGEFLAG(\([^,)]*\).*/SetPage\1/'		\
> +	--regex='/PAGEFLAG(\([^,)]*\).*/ClearPage\1/'		\
> +	--regex='/TESTSETFLAG(\([^,)]*\).*/TestSetPage\1/'	\
> +	--regex='/TESTPAGEFLAG(\([^,)]*\).*/Page\1/'		\
> +	--regex='/SETPAGEFLAG(\([^,)]*\).*/SetPage\1/'		\
> +	--regex='/__SETPAGEFLAG(\([^,)]*\).*/__SetPage\1/'	\
> +	--regex='/TESTCLEARFLAG(\([^,)]*\).*/TestClearPage\1/'	\
> +	--regex='/__TESTCLEARFLAG(\([^,)]*\).*/TestClearPage\1/'	\
> +	--regex='/CLEARPAGEFLAG(\([^,)]*\).*/ClearPage\1/'	\
> +	--regex='/__CLEARPAGEFLAG(\([^,)]*\).*/__ClearPage\1/'	\
> +	--regex='/__PAGEFLAG(\([^,)]*\).*/__SetPage\1/'		\
> +	--regex='/__PAGEFLAG(\([^,)]*\).*/__ClearPage\1/'	\
> +	--regex='/PAGEFLAG_FALSE(\([^,)]*\).*/Page\1/'		\
> +	--regex='/TESTSCFLAG(\([^,)]*\).*/TestSetPage\1/'	\
> +	--regex='/TESTSCFLAG(\([^,)]*\).*/TestClearPage\1/'	\
> +	--regex='/SETPAGEFLAG_NOOP(\([^,)]*\).*/SetPage\1/'	\
> +	--regex='/CLEARPAGEFLAG_NOOP(\([^,)]*\).*/ClearPage\1/'	\
> +	--regex='/__CLEARPAGEFLAG_NOOP(\([^,)]*\).*/__ClearPage\1/' \
> +	--regex='/TESTCLEARFLAG_FALSE(\([^,)]*\).*/TestClearPage\1/' \
> +	--regex='/__TESTCLEARFLAG_FALSE(\([^,)]*\).*/__TestClearPage\1/' \
> +	--regex='/_PE(\([^,)]*\).*/PEVENT_ERRNO__\1/'		\
> +	--regex='/PCI_OP_READ(\([a-z]*[a-z]\).*[1-4])/pci_bus_read_config_\1/' \
> +	--regex='/PCI_OP_WRITE(\([a-z]*[a-z]\).*[1-4])/pci_bus_write_config_\1/'
>  
>  	all_kconfigs | xargs $1 -a                              \
>  	--regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'
> 

This works for me. Thanks.

Tested-by: Jesper Juhl <jj@chaosbits.net>


-- 
Jesper Juhl <jj@chaosbits.net>       http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
Plain text mails only, please.

Re: how to look for source code in kernel

[Borislav Petkov]

On Fri, Dec 28, 2012 at 11:03:40PM +0100, Geert Uytterhoeven wrote:
> That's the first run. Now everything is in the buffer cache (assumed
> you have enough RAM), and try again...

Right, until you do something else on the box requiring just the right
amount of memory to overflow the buffer cache working set and start
kicking out pages. Btw, the thing has 4G of RAM.

* first run:

$  time git ls-files | xargs grep -E 'struct mce\W*{'
arch/x86/include/uapi/asm/mce.h:struct mce {
arch/x86/kernel/cpu/mcheck/mce.c:               if (!final || memcmp(m, final, sizeof(struct mce))) {

real    2m48.415s
user    0m2.388s
sys     0m15.668s

* second run coming from the buffer cache, search for something else:

$ time git ls-files | xargs grep -E 'struct task_struct\W*{'
include/linux/sched.h:struct task_struct {

real    0m1.651s
user    0m0.672s
sys     0m1.048s

* do something else (kernel build, git gc, some (very leaky) userspace
memory hog, whatever :)) which kicks some buffer cache pages out:

$ time git ls-files | xargs grep -E 'struct mce\W*{'
arch/x86/include/uapi/asm/mce.h:struct mce {
arch/x86/kernel/cpu/mcheck/mce.c:               if (!final || memcmp(m, final, sizeof(struct mce))) {

real    0m37.360s
user    0m1.152s
sys     0m4.176s

so on a machine with a lot of memory and an SSD, you can probably safely
rely on the buffer cache but not on a laptop, in my experience.

Btw, cscope can also grep for regex patterns so you don't need the git
grep thing anymore, especially since it looks at tracked files only.

Thanks.

-- 
Regards/Gruss,
Boris.

Re: [PATCH] scripts/tags.sh: Fix regex syntax for etags

[Michal Marek]

On Sat, Dec 29, 2012 at 12:22:44AM +0100, Jesper Juhl wrote:
> On Sat, 29 Dec 2012, Andreas Schwab wrote:
> 
> > Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
> > ---
> >  scripts/tags.sh | 50 +++++++++++++++++++++++++-------------------------
> >  1 file changed, 25 insertions(+), 25 deletions(-)
[...] 
> This works for me. Thanks.
> 
> Tested-by: Jesper Juhl <jj@chaosbits.net>

Applied to kbuild.git#misc, thanks.

Michal