linux-kernel - Re: [PATCH v3 2/8] KVM: selftests: Add demand paging content to the demand paging test

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Message-ID: <20200107160035.GG219677@xz-x1>
Date:   Tue, 7 Jan 2020 11:00:35 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Cannon Matthews <cannonmatthews@...gle.com>,
        Andrew Jones <drjones@...hat.com>
Subject: Re: [PATCH v3 2/8] KVM: selftests: Add demand paging content to the
 demand paging test

On Mon, Dec 16, 2019 at 01:38:55PM -0800, Ben Gardon wrote:

[...]

> +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;
> +
> +		/*
> +		 * TODO this introduces a 0.5sec delay at the end of the test.
> +		 * Reduce the timeout or eliminate it following the example in
> +		 * tools/testing/selftests/vm/userfaultfd.c
> +		 */
> +		r = poll(pollfd, 1, 500);

Would you mind implement it instead of adding a todo?  IIUC it's as
simple as a few more lines than the comment itself.  Thanks,

-- 
Peter Xu