From: Andi Kleen <a...@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.
2012-09-06 Andi Kleen <a...@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
