lkml.org 
[lkml]   [2008]   [Feb]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/4] x86 mmiotrace: fix relay-buffer-full flag for SMP
Pekka Paalanen a écrit :
> Relay has per-cpu buffers, but mmiotrace was using only a single flag
> for detecting buffer full/not-full transitions. The new code makes
> this per-cpu and actually counts missed events.
>
> Signed-off-by: Pekka Paalanen <pq@iki.fi>
> ---
> arch/x86/kernel/mmiotrace/mmio-mod.c | 26 ++++++++++++++++----------
> 1 files changed, 16 insertions(+), 10 deletions(-)
>
> diff --git a/arch/x86/kernel/mmiotrace/mmio-mod.c b/arch/x86/kernel/mmiotrace/mmio-mod.c
> index 82ae920..f492b65 100644
> --- a/arch/x86/kernel/mmiotrace/mmio-mod.c
> +++ b/arch/x86/kernel/mmiotrace/mmio-mod.c
> @@ -29,6 +29,7 @@
> #include <asm/pgtable.h>
> #include <linux/mmiotrace.h>
> #include <asm/e820.h> /* for ISA_START_ADDRESS */
> +#include <asm/atomic.h>
>
> #include "kmmio.h"
> #include "pf_in.h"
> @@ -47,9 +48,13 @@ struct trap_reason {
> int active_traces;
> };
>
> +/* Accessed per-cpu. */
> static struct trap_reason pf_reason[NR_CPUS];
> static struct mm_io_header_rw cpu_trace[NR_CPUS];
>
> +/* Access to this is not per-cpu. */
> +static atomic_t dropped[NR_CPUS];
> +

Please dont introduce NR_CPUS new arrays, since people are working hard to zap
them from kernel.

You probably can use a per_cpu variable ?

Thank you

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2008-02-05 21:47    [W:0.108 / U:0.132 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site