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From: Peter Xu <peterx@redhat.com>
To: Ben Gardon <bgardon@google.com>
Cc: kvm@vger.kernel.org, linux-kselftest@vger.kernel.org,
	Paolo Bonzini <pbonzini@redhat.com>,
	Cannon Matthews <cannonmatthews@google.com>,
	Andrew Jones <drjones@redhat.com>
Subject: Re: [PATCH 2/9] KVM: selftests: Add demand paging content to the demand paging test
Date: Sun, 29 Sep 2019 15:11:57 +0800	[thread overview]
Message-ID: <20190929071157.GA8903@xz-x1> (raw)
In-Reply-To: <20190927161836.57978-3-bgardon@google.com>

On Fri, Sep 27, 2019 at 09:18:30AM -0700, Ben Gardon wrote:
> The demand paging test is currently a simple page access test which, while
> potentially useful, doesn't add much versus the existing dirty logging
> test. To improve the demand paging test, add a basic userfaultfd demand
> paging implementation.
> 
> Signed-off-by: Ben Gardon <bgardon@google.com>
> ---
>  .../selftests/kvm/demand_paging_test.c        | 157 ++++++++++++++++++
>  1 file changed, 157 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
> index 5f214517ba1de..61ba4e6a8214a 100644
> --- a/tools/testing/selftests/kvm/demand_paging_test.c
> +++ b/tools/testing/selftests/kvm/demand_paging_test.c
> @@ -11,11 +11,14 @@
>  
>  #include <stdio.h>
>  #include <stdlib.h>
> +#include <sys/syscall.h>

[1]

>  #include <unistd.h>
>  #include <time.h>
> +#include <poll.h>
>  #include <pthread.h>
>  #include <linux/bitmap.h>
>  #include <linux/bitops.h>
> +#include <linux/userfaultfd.h>
>  
>  #include "test_util.h"
>  #include "kvm_util.h"
> @@ -29,6 +32,8 @@
>  /* Default guest test virtual memory offset */
>  #define DEFAULT_GUEST_TEST_MEM		0xc0000000
>  
> +#define __NR_userfaultfd 323

This line can be dropped if with [1] above?

[...]

> +static void *uffd_handler_thread_fn(void *arg)
> +{
> +	struct uffd_handler_args *uffd_args = (struct uffd_handler_args *)arg;
> +	int uffd = uffd_args->uffd;
> +	int64_t pages = 0;
> +
> +	while (!quit_uffd_thread) {
> +		struct uffd_msg msg;
> +		struct pollfd pollfd[1];
> +		int r;
> +		uint64_t addr;
> +
> +		pollfd[0].fd = uffd;
> +		pollfd[0].events = POLLIN;
> +
> +		r = poll(pollfd, 1, 2000);

This may introduce an unecessary 2s delay when quit.  Maybe we can
refer to how userfaultfd selftest did with this (please see
uffd_poll_thread() in selftests/vm/userfaultfd.c on usage of pipefd).

Thanks,

-- 
Peter Xu

  reply	other threads:[~2019-09-29  7:12 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-27 16:18 [PATCH 0/9] Create a userfaultfd " Ben Gardon
2019-09-27 16:18 ` [PATCH 1/9] KVM: selftests: Create a " Ben Gardon
2019-09-27 16:18 ` [PATCH 2/9] KVM: selftests: Add demand paging content to the " Ben Gardon
2019-09-29  7:11   ` Peter Xu [this message]
2019-09-27 16:18 ` [PATCH 3/9] KVM: selftests: Add memory size parameter " Ben Gardon
2019-09-27 16:18 ` [PATCH 4/9] KVM: selftests: Pass args to vCPU instead of using globals Ben Gardon
2019-10-03  7:38   ` Andrew Jones
2019-09-27 16:18 ` [PATCH 5/9] KVM: selftests: Support multiple vCPUs in demand paging test Ben Gardon
2019-09-27 16:18 ` [PATCH 6/9] KVM: selftests: Time guest demand paging Ben Gardon
2019-09-27 16:18 ` [PATCH 7/9] KVM: selftests: Add parameter to _vm_create for memslot 0 base paddr Ben Gardon
2019-10-03  8:10   ` Andrew Jones
2019-09-27 16:18 ` [PATCH 8/9] KVM: selftests: Support large VMs in demand paging test Ben Gardon
2019-09-29  7:22 ` [PATCH 0/9] Create a userfaultfd " Peter Xu
2019-09-30 17:02   ` Ben Gardon

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