[CRIU] [PATCH v4 4/6] mem: add dump state of THP_DISABLED prctl

[Pavel Emelyanov]

On 06/28/2017 09:43 AM, Mike Rapoport wrote:
> Signed-off-by: Mike Rapoport <rppt at linux.vnet.ibm.com>
> ---
>  criu/cr-dump.c          | 3 +++
>  criu/include/parasite.h | 1 +
>  criu/pie/parasite.c     | 1 +
>  images/mm.proto         | 1 +
>  4 files changed, 6 insertions(+)
> 
> diff --git a/criu/cr-dump.c b/criu/cr-dump.c
> index 3f9f8d0..308cc4e 100644
> --- a/criu/cr-dump.c
> +++ b/criu/cr-dump.c
> @@ -507,6 +507,9 @@ static int dump_task_mm(pid_t pid, const struct proc_pid_stat *stat,
>  	mme.dumpable = misc->dumpable;
>  	mme.has_dumpable = true;
>  
> +	mme.thp_disabled = misc->thp_disabled;
> +	mme.has_thp_disabled = true;
> +
>  	mme.n_mm_saved_auxv = AT_VECTOR_SIZE;
>  	mme.mm_saved_auxv = xmalloc(pb_repeated_size(&mme, mm_saved_auxv));
>  	if (!mme.mm_saved_auxv)
> diff --git a/criu/include/parasite.h b/criu/include/parasite.h
> index cd6d793..115891f 100644
> --- a/criu/include/parasite.h
> +++ b/criu/include/parasite.h
> @@ -124,6 +124,7 @@ struct parasite_dump_misc {
>  	u32 umask;
>  
>  	int dumpable;
> +	int thp_disabled;
>  };
>  
>  /*
> diff --git a/criu/pie/parasite.c b/criu/pie/parasite.c
> index fe08e72..78bbe9e 100644
> --- a/criu/pie/parasite.c
> +++ b/criu/pie/parasite.c
> @@ -177,6 +177,7 @@ static int dump_misc(struct parasite_dump_misc *args)
>  	args->umask = sys_umask(0);
>  	sys_umask(args->umask); /* never fails */
>  	args->dumpable = sys_prctl(PR_GET_DUMPABLE, 0, 0, 0, 0);
> +	args->thp_disabled = sys_prctl(PR_GET_THP_DISABLE, 0, 0, 0, 0);

How will this work OK on kernels without this prctl fixed?

>  	return 0;
>  }
> diff --git a/images/mm.proto b/images/mm.proto
> index b372f45..e0f14c6 100644
> --- a/images/mm.proto
> +++ b/images/mm.proto
> @@ -29,4 +29,5 @@ message mm_entry {
>  
>  	optional int32	dumpable	= 15;
>  	repeated aio_ring_entry	aios	= 16;
> +	optional bool thp_disabled	= 17;
>  }
>