diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/ia64/Kconfig | 11 | ||||
| -rw-r--r-- | arch/ia64/ia32/elfcore32.h | 14 | ||||
| -rw-r--r-- | arch/ia64/kernel/asm-offsets.c | 6 | ||||
| -rw-r--r-- | arch/ia64/kernel/entry.S | 65 | ||||
| -rw-r--r-- | arch/ia64/kernel/fsys.S | 26 | ||||
| -rw-r--r-- | arch/ia64/kernel/head.S | 20 | ||||
| -rw-r--r-- | arch/ia64/kernel/ivt.S | 69 | ||||
| -rw-r--r-- | arch/ia64/kernel/minstate.h | 14 | ||||
| -rw-r--r-- | arch/ia64/kernel/time.c | 78 |
9 files changed, 302 insertions, 1 deletions
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 8fa3faf5ef1b..eef457fda08f 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -283,6 +283,17 @@ config FORCE_MAX_ZONEORDER default "17" if HUGETLB_PAGE default "11" +config VIRT_CPU_ACCOUNTING + bool "Deterministic task and CPU time accounting" + default n + help + Select this option to enable more accurate task and CPU time + accounting. This is done by reading a CPU counter on each + kernel entry and exit and on transitions within the kernel + between system, softirq and hardirq state, so there is a + small performance impact. + If in doubt, say N here. + config SMP bool "Symmetric multi-processing support" help diff --git a/arch/ia64/ia32/elfcore32.h b/arch/ia64/ia32/elfcore32.h index 446c9aac924d..9a3abf58cea3 100644 --- a/arch/ia64/ia32/elfcore32.h +++ b/arch/ia64/ia32/elfcore32.h @@ -30,7 +30,19 @@ struct elf_siginfo int si_errno; /* errno */ }; -#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0) +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +/* + * Hacks are here since types between compat_timeval (= pair of s32) and + * ia64-native timeval (= pair of s64) are not compatible, at least a file + * arch/ia64/ia32/../../../fs/binfmt_elf.c will get warnings from compiler on + * use of cputime_to_timeval(), which usually an alias of jiffies_to_timeval(). + */ +#define cputime_to_timeval(a,b) \ + do { (b)->tv_usec = 0; (b)->tv_sec = (a)/NSEC_PER_SEC; } while(0) +#else +#define jiffies_to_timeval(a,b) \ + do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; } while(0) +#endif struct elf_prstatus { diff --git a/arch/ia64/kernel/asm-offsets.c b/arch/ia64/kernel/asm-offsets.c index 0aebc6f79e95..5865130b0a92 100644 --- a/arch/ia64/kernel/asm-offsets.c +++ b/arch/ia64/kernel/asm-offsets.c @@ -39,6 +39,12 @@ void foo(void) DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); DEFINE(TI_PRE_COUNT, offsetof(struct thread_info, preempt_count)); +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + DEFINE(TI_AC_STAMP, offsetof(struct thread_info, ac_stamp)); + DEFINE(TI_AC_LEAVE, offsetof(struct thread_info, ac_leave)); + DEFINE(TI_AC_STIME, offsetof(struct thread_info, ac_stime)); + DEFINE(TI_AC_UTIME, offsetof(struct thread_info, ac_utime)); +#endif BLANK(); diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S index 3c331c464b40..b0be4a280174 100644 --- a/arch/ia64/kernel/entry.S +++ b/arch/ia64/kernel/entry.S @@ -710,6 +710,16 @@ ENTRY(ia64_leave_syscall) (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk #endif .work_processed_syscall: +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + adds r2=PT(LOADRS)+16,r12 +(pUStk) mov.m r22=ar.itc // fetch time at leave + adds r18=TI_FLAGS+IA64_TASK_SIZE,r13 + ;; +(p6) ld4 r31=[r18] // load current_thread_info()->flags + ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs" + adds r3=PT(AR_BSPSTORE)+16,r12 // deferred + ;; +#else adds r2=PT(LOADRS)+16,r12 adds r3=PT(AR_BSPSTORE)+16,r12 adds r18=TI_FLAGS+IA64_TASK_SIZE,r13 @@ -718,6 +728,7 @@ ENTRY(ia64_leave_syscall) ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs" nop.i 0 ;; +#endif mov r16=ar.bsp // M2 get existing backing store pointer ld8 r18=[r2],PT(R9)-PT(B6) // load b6 (p6) and r15=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE? @@ -737,12 +748,21 @@ ENTRY(ia64_leave_syscall) ld8 r29=[r2],16 // M0|1 load cr.ipsr ld8 r28=[r3],16 // M0|1 load cr.iip +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +(pUStk) add r14=TI_AC_LEAVE+IA64_TASK_SIZE,r13 + ;; + ld8 r30=[r2],16 // M0|1 load cr.ifs + ld8 r25=[r3],16 // M0|1 load ar.unat +(pUStk) add r15=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13 + ;; +#else mov r22=r0 // A clear r22 ;; ld8 r30=[r2],16 // M0|1 load cr.ifs ld8 r25=[r3],16 // M0|1 load ar.unat (pUStk) add r14=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13 ;; +#endif ld8 r26=[r2],PT(B0)-PT(AR_PFS) // M0|1 load ar.pfs (pKStk) mov r22=psr // M2 read PSR now that interrupts are disabled nop 0 @@ -759,7 +779,11 @@ ENTRY(ia64_leave_syscall) ld8.fill r1=[r3],16 // M0|1 load r1 (pUStk) mov r17=1 // A ;; +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +(pUStk) st1 [r15]=r17 // M2|3 +#else (pUStk) st1 [r14]=r17 // M2|3 +#endif ld8.fill r13=[r3],16 // M0|1 mov f8=f0 // F clear f8 ;; @@ -775,12 +799,22 @@ ENTRY(ia64_leave_syscall) shr.u r18=r19,16 // I0|1 get byte size of existing "dirty" partition cover // B add current frame into dirty partition & set cr.ifs ;; +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + mov r19=ar.bsp // M2 get new backing store pointer + st8 [r14]=r22 // M save time at leave + mov f10=f0 // F clear f10 + + mov r22=r0 // A clear r22 + movl r14=__kernel_syscall_via_epc // X + ;; +#else mov r19=ar.bsp // M2 get new backing store pointer mov f10=f0 // F clear f10 nop.m 0 movl r14=__kernel_syscall_via_epc // X ;; +#endif mov.m ar.csd=r0 // M2 clear ar.csd mov.m ar.ccv=r0 // M2 clear ar.ccv mov b7=r14 // I0 clear b7 (hint with __kernel_syscall_via_epc) @@ -913,10 +947,18 @@ GLOBAL_ENTRY(ia64_leave_kernel) adds r16=PT(CR_IPSR)+16,r12 adds r17=PT(CR_IIP)+16,r12 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + .pred.rel.mutex pUStk,pKStk +(pKStk) mov r22=psr // M2 read PSR now that interrupts are disabled +(pUStk) mov.m r22=ar.itc // M fetch time at leave + nop.i 0 + ;; +#else (pKStk) mov r22=psr // M2 read PSR now that interrupts are disabled nop.i 0 nop.i 0 ;; +#endif ld8 r29=[r16],16 // load cr.ipsr ld8 r28=[r17],16 // load cr.iip ;; @@ -938,15 +980,37 @@ GLOBAL_ENTRY(ia64_leave_kernel) ;; ld8.fill r12=[r16],16 ld8.fill r13=[r17],16 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +(pUStk) adds r3=TI_AC_LEAVE+IA64_TASK_SIZE,r18 +#else (pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18 +#endif ;; ld8 r20=[r16],16 // ar.fpsr ld8.fill r15=[r17],16 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +(pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18 // deferred +#endif ;; ld8.fill r14=[r16],16 ld8.fill r2=[r17] (pUStk) mov r17=1 ;; +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + // mmi_ : ld8 st1 shr;; mmi_ : st8 st1 shr;; + // mib : mov add br -> mib : ld8 add br + // bbb_ : br nop cover;; mbb_ : mov br cover;; + // + // no one require bsp in r16 if (pKStk) branch is selected. +(pUStk) st8 [r3]=r22 // save time at leave +(pUStk) st1 [r18]=r17 // restore current->thread.on_ustack + shr.u r18=r19,16 // get byte size of existing "dirty" partition + ;; + ld8.fill r3=[r16] // deferred + LOAD_PHYS_STACK_REG_SIZE(r17) +(pKStk) br.cond.dpnt skip_rbs_switch + mov r16=ar.bsp // get existing backing store pointer +#else ld8.fill r3=[r16] (pUStk) st1 [r18]=r17 // restore current->thread.on_ustack shr.u r18=r19,16 // get byte size of existing "dirty" partition @@ -954,6 +1018,7 @@ GLOBAL_ENTRY(ia64_leave_kernel) mov r16=ar.bsp // get existing backing store pointer LOAD_PHYS_STACK_REG_SIZE(r17) (pKStk) br.cond.dpnt skip_rbs_switch +#endif /* * Restore user backing store. diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S index 6a72db7ddecc..357b7e2adc63 100644 --- a/arch/ia64/kernel/fsys.S +++ b/arch/ia64/kernel/fsys.S @@ -656,7 +656,11 @@ GLOBAL_ENTRY(fsys_bubble_down) nop.i 0 ;; mov ar.rsc=0 // M2 set enforced lazy mode, pl 0, LE, loadrs=0 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + mov.m r30=ar.itc // M get cycle for accounting +#else nop.m 0 +#endif nop.i 0 ;; mov r23=ar.bspstore // M2 (12 cyc) save ar.bspstore @@ -678,6 +682,28 @@ GLOBAL_ENTRY(fsys_bubble_down) cmp.ne pKStk,pUStk=r0,r0 // A set pKStk <- 0, pUStk <- 1 br.call.sptk.many b7=ia64_syscall_setup // B ;; +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + // mov.m r30=ar.itc is called in advance + add r16=TI_AC_STAMP+IA64_TASK_SIZE,r2 + add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r2 + ;; + ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel + ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at leave kernel + ;; + ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime + ld8 r21=[r17] // cumulated utime + sub r22=r19,r18 // stime before leave kernel + ;; + st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP // update stamp + sub r18=r30,r19 // elapsed time in user mode + ;; + add r20=r20,r22 // sum stime + add r21=r21,r18 // sum utime + ;; + st8 [r16]=r20 // update stime + st8 [r17]=r21 // update utime + ;; +#endif mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0 mov rp=r14 // I0 set the real return addr and r3=_TIF_SYSCALL_TRACEAUDIT,r3 // A diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S index d3a41d5f8d12..ddeab4e36fd5 100644 --- a/arch/ia64/kernel/head.S +++ b/arch/ia64/kernel/head.S @@ -1002,6 +1002,26 @@ GLOBAL_ENTRY(sched_clock) br.ret.sptk.many rp END(sched_clock) +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +GLOBAL_ENTRY(cycle_to_cputime) + alloc r16=ar.pfs,1,0,0,0 + addl r8=THIS_CPU(cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0 + ;; + ldf8 f8=[r8] + ;; + setf.sig f9=r32 + ;; + xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc) + xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product + ;; + getf.sig r8=f10 // (5 cyc) + getf.sig r9=f11 + ;; + shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT + br.ret.sptk.many rp +END(cycle_to_cputime) +#endif /* CONFIG_VIRT_CPU_ACCOUNTING */ + GLOBAL_ENTRY(start_kernel_thread) .prologue .save rp, r0 // this is the end of the call-chain diff --git a/arch/ia64/kernel/ivt.S b/arch/ia64/kernel/ivt.S index 34f44d8be00d..6678c49daba3 100644 --- a/arch/ia64/kernel/ivt.S +++ b/arch/ia64/kernel/ivt.S @@ -805,8 +805,13 @@ ENTRY(break_fault) (p8) adds r28=16,r28 // A switch cr.iip to next bundle (p9) adds r8=1,r8 // A increment ei to next slot +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + ;; + mov b6=r30 // I0 setup syscall handler branch reg early +#else nop.i 0 ;; +#endif mov.m r25=ar.unat // M2 (5 cyc) dep r29=r8,r29,41,2 // I0 insert new ei into cr.ipsr @@ -817,7 +822,11 @@ ENTRY(break_fault) // /////////////////////////////////////////////////////////////////////// st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + mov.m r30=ar.itc // M get cycle for accounting +#else mov b6=r30 // I0 setup syscall handler branch reg early +#endif cmp.eq pKStk,pUStk=r0,r17 // A were we on kernel stacks already? and r9=_TIF_SYSCALL_TRACEAUDIT,r9 // A mask trace or audit @@ -829,6 +838,30 @@ ENTRY(break_fault) cmp.eq p14,p0=r9,r0 // A are syscalls being traced/audited? br.call.sptk.many b7=ia64_syscall_setup // B 1: +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + // mov.m r30=ar.itc is called in advance, and r13 is current + add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13 // A + add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13 // A +(pKStk) br.cond.spnt .skip_accounting // B unlikely skip + ;; + ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // M get last stamp + ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // M time at leave + ;; + ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME // M cumulated stime + ld8 r21=[r17] // M cumulated utime + sub r22=r19,r18 // A stime before leave + ;; + st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP // M update stamp + sub r18=r30,r19 // A elapsed time in user + ;; + add r20=r20,r22 // A sum stime + add r21=r21,r18 // A sum utime + ;; + st8 [r16]=r20 // M update stime + st8 [r17]=r21 // M update utime + ;; +.skip_accounting: +#endif mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0 nop 0 bsw.1 // B (6 cyc) regs are saved, switch to bank 1 @@ -928,6 +961,7 @@ END(interrupt) * - r27: saved ar.rsc * - r28: saved cr.iip * - r29: saved cr.ipsr + * - r30: ar.itc for accounting (don't touch) * - r31: saved pr * - b0: original contents (to be saved) * On exit: @@ -1090,6 +1124,41 @@ END(dispatch_illegal_op_fault) DBG_FAULT(16) FAULT(16) +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + /* + * There is no particular reason for this code to be here, other than + * that there happens to be space here that would go unused otherwise. + * If this fault ever gets "unreserved", simply moved the following + * code to a more suitable spot... + * + * account_sys_enter is called from SAVE_MIN* macros if accounting is + * enabled and if the macro is entered from user mode. + */ +ENTRY(account_sys_enter) + // mov.m r20=ar.itc is called in advance, and r13 is current + add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13 + add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13 + ;; + ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel + ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at left from kernel + ;; + ld8 r23=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime + ld8 r21=[r17] // cumulated utime + sub r22=r19,r18 // stime before leave kernel + ;; + st8 [r16]=r20,TI_AC_STIME-TI_AC_STAMP // update stamp + sub r18=r20,r19 // elapsed time in user mode + ;; + add r23=r23,r22 // sum stime + add r21=r21,r18 // sum utime + ;; + st8 [r16]=r23 // update stime + st8 [r17]=r21 // update utime + ;; + br.ret.sptk.many rp +END(account_sys_enter) +#endif + .org ia64_ivt+0x4400 ///////////////////////////////////////////////////////////////////////////////////////// // 0x4400 Entry 17 (size 64 bundles) Reserved diff --git a/arch/ia64/kernel/minstate.h b/arch/ia64/kernel/minstate.h index c9ac8bada786..7c548ac52bbc 100644 --- a/arch/ia64/kernel/minstate.h +++ b/arch/ia64/kernel/minstate.h @@ -3,6 +3,18 @@ #include "entry.h" +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +/* read ar.itc in advance, and use it before leaving bank 0 */ +#define ACCOUNT_GET_STAMP \ +(pUStk) mov.m r20=ar.itc; +#define ACCOUNT_SYS_ENTER \ +(pUStk) br.call.spnt rp=account_sys_enter \ + ;; +#else +#define ACCOUNT_GET_STAMP +#define ACCOUNT_SYS_ENTER +#endif + /* * DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves * the minimum state necessary that allows us to turn psr.ic back @@ -122,11 +134,13 @@ ;; \ .mem.offset 0,0; st8.spill [r16]=r2,16; \ .mem.offset 8,0; st8.spill [r17]=r3,16; \ + ACCOUNT_GET_STAMP \ adds r2=IA64_PT_REGS_R16_OFFSET,r1; \ ;; \ EXTRA; \ movl r1=__gp; /* establish kernel global pointer */ \ ;; \ + ACCOUNT_SYS_ENTER \ bsw.1; /* switch back to bank 1 (must be last in insn group) */ \ ;; diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c index 17fda5293c67..48e15a51782f 100644 --- a/arch/ia64/kernel/time.c +++ b/arch/ia64/kernel/time.c @@ -59,6 +59,84 @@ static struct clocksource clocksource_itc = { }; static struct clocksource *itc_clocksource; +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + +#include <linux/kernel_stat.h> + +extern cputime_t cycle_to_cputime(u64 cyc); + +/* + * Called from the context switch with interrupts disabled, to charge all + * accumulated times to the current process, and to prepare accounting on + * the next process. + */ +void ia64_account_on_switch(struct task_struct *prev, struct task_struct *next) +{ + struct thread_info *pi = task_thread_info(prev); + struct thread_info *ni = task_thread_info(next); + cputime_t delta_stime, delta_utime; + __u64 now; + + now = ia64_get_itc(); + + delta_stime = cycle_to_cputime(pi->ac_stime + (now - pi->ac_stamp)); + account_system_time(prev, 0, delta_stime); + account_system_time_scaled(prev, delta_stime); + + if (pi->ac_utime) { + delta_utime = cycle_to_cputime(pi->ac_utime); + account_user_time(prev, delta_utime); + account_user_time_scaled(prev, delta_utime); + } + + pi->ac_stamp = ni->ac_stamp = now; + ni->ac_stime = ni->ac_utime = 0; +} + +/* + * Account time for a transition between system, hard irq or soft irq state. + * Note that this function is called with interrupts enabled. + */ +void account_system_vtime(struct task_struct *tsk) +{ + struct thread_info *ti = task_thread_info(tsk); + unsigned long flags; + cputime_t delta_stime; + __u64 now; + + local_irq_save(flags); + + now = ia64_get_itc(); + + delta_stime = cycle_to_cputime(ti->ac_stime + (now - ti->ac_stamp)); + account_system_time(tsk, 0, delta_stime); + account_system_time_scaled(tsk, delta_stime); + ti->ac_stime = 0; + + ti->ac_stamp = now; + + local_irq_restore(flags); +} + +/* + * Called from the timer interrupt handler to charge accumulated user time + * to the current process. Must be called with interrupts disabled. + */ +void account_process_tick(struct task_struct *p, int user_tick) +{ + struct thread_info *ti = task_thread_info(p); + cputime_t delta_utime; + + if (ti->ac_utime) { + delta_utime = cycle_to_cputime(ti->ac_utime); + account_user_time(p, delta_utime); + account_user_time_scaled(p, delta_utime); + ti->ac_utime = 0; + } +} + +#endif /* CONFIG_VIRT_CPU_ACCOUNTING */ + static irqreturn_t timer_interrupt (int irq, void *dev_id) { |