[PATCH] Add -fmem-report-wpa

[Richard Guenther]

On Fri, Sep 7, 2012 at 7:01 AM, Andi Kleen <andi@firstfloor.org> wrote:
> From: Andi Kleen <ak@linux.intel.com>
>
> For parallel LTO builds setting -fmem-report does not work very well
> because all the LTRANS phases dump it in parallel and typically interleave
> it to unreadability.
>
> Since usually the memory bottleneck is WPA add a flag to only dump
> the memory report for that.
>
> Passed bootstrap and testsuite on x86_64.

Ok.

Thanks,
Richard.

> 2012-09-06  Andi Kleen  <ak@my.domain.org>
>
>         * gcc/common.opt (-fmem-report-wpa): Add
>         * gcc/doc/invoke.texi (-fmem-report-wpa): Document.
>         * gcc/lto/lto.c (do_whole_program_analysis): Run mem_report
>         when mem_report_wpa is set.
> ---
>  gcc/common.opt      |    4 ++++
>  gcc/doc/invoke.texi |    7 ++++++-
>  gcc/lto/lto.c       |    2 ++
>  3 files changed, 12 insertions(+), 1 deletions(-)
>
> diff --git a/gcc/common.opt b/gcc/common.opt
> index 87e28b5..73eebf4 100644
> --- a/gcc/common.opt
> +++ b/gcc/common.opt
> @@ -1470,6 +1470,10 @@ fmem-report
>  Common Report Var(mem_report)
>  Report on permanent memory allocation
>
> +fmem-report-wpa
> +Common Report Var(mem_report_wpa)
> +Report on permanent memory allocation in WPA only
> +
>  ; This will attempt to merge constant section constants, if 1 only
>  ; string constants and constants from constant pool, if 2 also constant
>  ; variables.
> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
> index 6cf7cec..5a5f9d2 100644
> --- a/gcc/doc/invoke.texi
> +++ b/gcc/doc/invoke.texi
> @@ -328,7 +328,7 @@ Objective-C and Objective-C++ Dialects}.
>  -feliminate-unused-debug-symbols -femit-class-debug-always @gol
>  -fenable-@var{kind}-@var{pass} @gol
>  -fenable-@var{kind}-@var{pass}=@var{range-list} @gol
> --fdebug-types-section @gol
> +-fdebug-types-section -fmem-report-wpa @gol
>  -fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report -fprofile-arcs @gol
>  -frandom-seed=@var{string} -fsched-verbose=@var{n} @gol
>  -fsel-sched-verbose -fsel-sched-dump-cfg -fsel-sched-pipelining-verbose @gol
> @@ -5132,6 +5132,11 @@ pass when it finishes.
>  Makes the compiler print some statistics about permanent memory
>  allocation when it finishes.
>
> +@item -fmem-report-wpa
> +@opindex fmem-report-wpa
> +Makes the compiler print some statistics about permanent memory
> +allocation for the WPA phase only.
> +
>  @item -fpre-ipa-mem-report
>  @opindex fpre-ipa-mem-report
>  @item -fpost-ipa-mem-report
> diff --git a/gcc/lto/lto.c b/gcc/lto/lto.c
> index 5da5412..3c59299 100644
> --- a/gcc/lto/lto.c
> +++ b/gcc/lto/lto.c
> @@ -2016,6 +2016,8 @@ do_whole_program_analysis (void)
>    /* Show the LTO report before launching LTRANS.  */
>    if (flag_lto_report)
>      print_lto_report ();
> +  if (mem_report_wpa)
> +    dump_mem_report ();
>  }
>
>
> --
> 1.7.7
>