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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
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