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From: Philippe W. <phi...@sk...> - 2017-04-28 21:17:14
|
On Fri, 2017-04-28 at 17:46 +0000, Mineeva, Tatyana A wrote: > One question, mostly out of curiosity: > KNL architecture is better suited for parallel applications, and > Valgrind’s serialization could cause a significant overhead on KNLs. I > know there were some attempts to make Valgrind multi-threaded. Could > you please point out the main difficulties of parallelizing Valgrind? A presentation was done at FOSDEM about a (very partial) prototype : See https://archive.fosdem.org/2015/schedule/event/valgrind_multi_prototype/ In the SVN MTV branch, the file docs/internals/mtV.txt gives some more information. This proto has shown that there is a lot of work (still) to do but IMO, the biggest challenge was to have a memcheck VA bit data structure that is both fast, thread safe, and not causing false positive or false negative. Philippe |
|
From: <sv...@va...> - 2017-04-28 12:53:09
|
Author: petarj
Date: Fri Apr 28 13:53:00 2017
New Revision: 16316
Log:
mips: add missing assembler directives to please Clang
Add missing assembler directives in VG_MINIMAL_SETJMP() and
do_syscall_WRK().
Minor rewrite of do_syscall_WRK() to use delay slots.
Modified:
trunk/coregrind/m_libcsetjmp.c
trunk/coregrind/m_syscall.c
Modified: trunk/coregrind/m_libcsetjmp.c
==============================================================================
--- trunk/coregrind/m_libcsetjmp.c (original)
+++ trunk/coregrind/m_libcsetjmp.c Fri Apr 28 13:53:00 2017
@@ -575,6 +575,7 @@
" nop \n\t"
".previous \n\t"
" \n\t"
+".text \n\t"
".globl VG_MINIMAL_LONGJMP; \n\t"
".align 2; \n\t"
"VG_MINIMAL_LONGJMP: \n\t" /* a0 = jmp_buf */
Modified: trunk/coregrind/m_syscall.c
==============================================================================
--- trunk/coregrind/m_syscall.c (original)
+++ trunk/coregrind/m_syscall.c Fri Apr 28 13:53:00 2017
@@ -790,42 +790,49 @@
int a4, int a5, int a6, int syscall_no, UWord *err,
UWord *valHi, UWord* valLo
);
-asm(
-".globl do_syscall_WRK\n"
-".ent do_syscall_WRK\n"
-".text\n"
-"do_syscall_WRK:\n"
-" lw $2, 24($29)\n"
-" syscall\n"
-" lw $8, 28($29)\n"
-" sw $7, ($8)\n"
-" lw $8, 32($29)\n"
-" sw $3, ($8)\n" // store valHi
-" lw $8, 36($29)\n"
-" sw $2, ($8)\n" // store valLo
-" jr $31\n"
-" nop\n"
-".previous\n"
-".end do_syscall_WRK\n"
+asm (
+ ".text \n\t"
+ ".globl do_syscall_WRK \n\t"
+ ".type do_syscall_WRK, @function \n\t"
+ ".set push \n\t"
+ ".set noreorder \n\t"
+ "do_syscall_WRK: \n\t"
+ " lw $2, 24($29) \n\t"
+ " syscall \n\t"
+ " lw $8, 28($29) \n\t"
+ " sw $7, ($8) \n\t"
+ " lw $8, 32($29) \n\t"
+ " sw $3, ($8) \n\t" /* store valHi */
+ " lw $8, 36($29) \n\t"
+ " jr $31 \n\t"
+ " sw $2, ($8) \n\t" /* store valLo */
+ ".size do_syscall_WRK, .-do_syscall_WRK \n\t"
+ ".set pop \n\t"
+ ".previous \n\t"
);
#elif defined(VGP_mips64_linux)
extern UWord do_syscall_WRK ( UWord a1, UWord a2, UWord a3, UWord a4, UWord a5,
- UWord a6, UWord syscall_no, ULong* V1_val );
+ UWord a6, UWord syscall_no, ULong* V1_A3_val );
asm (
-".text\n"
-".globl do_syscall_WRK\n"
-"do_syscall_WRK:\n"
-" daddiu $29, $29, -8\n"
-" sd $11, 0($29)\n"
-" move $2, $10\n"
-" syscall\n"
-" ld $11, 0($29)\n"
-" daddiu $29, $29, 8\n"
-" sd $3, 0($11)\n" /* store vale of v1 in last param */
-" sd $7, 8($11)\n" /* store vale of a3 in last param */
-" jr $31\n"
-".previous\n"
+ ".text \n\t"
+ ".globl do_syscall_WRK \n\t"
+ ".type do_syscall_WRK, @function \n\t"
+ ".set push \n\t"
+ ".set noreorder \n\t"
+ "do_syscall_WRK: \n\t"
+ " daddiu $29, $29, -8 \n\t"
+ " sd $11, 0($29) \n\t"
+ " move $2, $10 \n\t"
+ " syscall \n\t"
+ " ld $11, 0($29) \n\t"
+ " daddiu $29, $29, 8 \n\t"
+ " sd $3, 0($11) \n\t" /* store v1 in last param */
+ " jr $31 \n\t"
+ " sd $7, 8($11) \n\t" /* store a3 in last param */
+ ".size do_syscall_WRK, .-do_syscall_WRK \n\t"
+ ".set pop \n\t"
+ ".previous \n\t"
);
#elif defined(VGP_tilegx_linux)
|