Counter API
Alexandre Martins
alexandre.martins at stormshield.eu
Fri Feb 3 13:02:25 UTC 2017
Hi Kontantin.
Your patch compille and run great in a 32 bit environment. I don't have a 64
bit one to check.
Thank you for your support.
Best regards
Alexandre
Le jeudi 2 février 2017, 18:01:59 Konstantin Belousov a écrit :
> On Thu, Feb 02, 2017 at 04:38:08PM +0100, Alexandre Martins wrote:
> > Hi all,
> >
> > Our companie is curently tracking performance issue with our ARM product.
> >
> > We have seen that counter API was migrated from intrinsic to atomic.
> >
> > https://svnweb.freebsd.org/base?view=revision&revision=269406
> >
> > But there is still the calls to critical_enter/leave in the macro
> > counter_enter/leave.
> >
> > Is that needed ? Can we remove that ?
>
> Try this. I did not even compiled the patch.
>
> diff --git a/sys/arm/include/counter.h b/sys/arm/include/counter.h
> index c4da91f7a14..950516e1616 100644
> --- a/sys/arm/include/counter.h
> +++ b/sys/arm/include/counter.h
> @@ -31,12 +31,9 @@
>
> #include <sys/pcpu.h>
> #include <machine/atomic.h>
> -#ifdef INVARIANTS
> -#include <sys/proc.h>
> -#endif
>
> -#define counter_enter() critical_enter()
> -#define counter_exit() critical_exit()
> +#define counter_enter() do {} while (0)
> +#define counter_exit() do {} while (0)
>
> #ifdef IN_SUBR_COUNTER_C
>
> @@ -55,7 +52,7 @@ counter_u64_fetch_inline(uint64_t *p)
> int i;
>
> r = 0;
> - for (i = 0; i < mp_ncpus; i++)
> + CPU_FOREACH(i)
> r += counter_u64_read_one((uint64_t *)p, i);
>
> return (r);
> @@ -78,18 +75,13 @@ counter_u64_zero_inline(counter_u64_t c)
> }
> #endif
>
> -#define counter_u64_add_protected(c, inc) do { \
> - CRITICAL_ASSERT(curthread); \
> - atomic_add_64((uint64_t *)zpcpu_get(c), (inc)); \
> -} while (0)
> +#define counter_u64_add_protected(c, inc) counter_u64_add(c, inc)
>
> static inline void
> counter_u64_add(counter_u64_t c, int64_t inc)
> {
>
> - counter_enter();
> - counter_u64_add_protected(c, inc);
> - counter_exit();
> + atomic_add_64((uint64_t *)zpcpu_get(c), inc);
> }
>
> #endif /* ! __MACHINE_COUNTER_H__ */
> diff --git a/sys/arm64/include/counter.h b/sys/arm64/include/counter.h
> index 9d56cce3d3d..cfa521f9b73 100644
> --- a/sys/arm64/include/counter.h
> +++ b/sys/arm64/include/counter.h
> @@ -30,12 +30,10 @@
> #define _MACHINE_COUNTER_H_
>
> #include <sys/pcpu.h>
> -#ifdef INVARIANTS
> -#include <sys/proc.h>
> -#endif
> +#include <machine/atomic.h>
>
> -#define counter_enter() critical_enter()
> -#define counter_exit() critical_exit()
> +#define counter_enter() do {} while (0)
> +#define counter_exit() do {} while (0)
>
> #ifdef IN_SUBR_COUNTER_C
> static inline uint64_t
> @@ -52,13 +50,12 @@ counter_u64_fetch_inline(uint64_t *p)
> int i;
>
> r = 0;
> - for (i = 0; i < mp_ncpus; i++)
> + CPU_FOREACH(i)
> r += counter_u64_read_one((uint64_t *)p, i);
>
> return (r);
> }
>
> -/* XXXKIB might interrupt increment */
> static void
> counter_u64_zero_one_cpu(void *arg)
> {
> @@ -76,18 +73,13 @@ counter_u64_zero_inline(counter_u64_t c)
> }
> #endif
>
> -#define counter_u64_add_protected(c, inc) do { \
> - CRITICAL_ASSERT(curthread); \
> - *(uint64_t *)zpcpu_get(c) += (inc); \
> -} while (0)
> +#define counter_u64_add_protected(c, inc) counter_u64_add(c, inc)
>
> static inline void
> counter_u64_add(counter_u64_t c, int64_t inc)
> {
>
> - counter_enter();
> - counter_u64_add_protected(c, inc);
> - counter_exit();
> + atomic_add_64((uint64_t *)zpcpu_get(c), inc);
> }
>
> #endif /* ! _MACHINE_COUNTER_H_ */
--
Alexandre Martins
STORMSHIELD
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