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From: Juergen Gross <jgross@suse.com>
To: Julien Grall <julien@xen.org>, xen-devel@lists.xenproject.org
Cc: raphning@amazon.co.uk, doebel@amazon.de,
	Julien Grall <jgrall@amazon.com>,
	Ian Jackson <iwj@xenproject.org>, Wei Liu <wl@xen.org>
Subject: Re: [PATCH 08/10] tools/xenstored: Extend restore code to handle multiple input buffer
Date: Thu, 24 Jun 2021 10:30:15 +0200	[thread overview]
Message-ID: <444688a1-180f-7cf3-3461-0001030471d4@suse.com> (raw)
In-Reply-To: <20210616144324.31652-9-julien@xen.org>


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On 16.06.21 16:43, Julien Grall wrote:
> From: Julien Grall <jgrall@amazon.com>
> 
> Currently, the restore code is considering the stream will contain at
> most one in-flight request per connection. In a follow-up changes, we
> will want to transfer multiple in-flight requests.
> 
> The function read_state_buffered() is now extended to restore multiple
> in-flight request. Complete requests will be queued as delayed
> requests, if there a partial request (only the last one can) then it
> will used as the current in-flight request.
> 
> Note that we want to bypass the quota check for delayed requests as
> the new Xenstore may have a lower limit.
> 
> Lastly, there is no need to change the specification as there was
> no restriction on the number of in-flight requests preserved.
> 
> Signed-off-by: Julien Grall <jgrall@amazon.com>
> ---
>   tools/xenstore/xenstored_core.c | 56 ++++++++++++++++++++++++++++-----
>   1 file changed, 48 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
> index a5084a5b173d..5b7ab7f74013 100644
> --- a/tools/xenstore/xenstored_core.c
> +++ b/tools/xenstore/xenstored_core.c
> @@ -1486,6 +1486,10 @@ static void process_message(struct connection *conn, struct buffered_data *in)
>   	enum xsd_sockmsg_type type = in->hdr.msg.type;
>   	int ret;
>   
> +	/* At least send_error() and send_reply() expects conn->in == in */
> +	assert(conn->in == in);
> +	trace_io(conn, in, 0);
> +
>   	if ((unsigned int)type >= XS_TYPE_COUNT || !wire_funcs[type].func) 
{
>   		eprintf("Client unknown operation %i", type);
>   		send_error(conn, ENOSYS);
> @@ -1515,6 +1519,23 @@ static void process_message(struct connection *conn, struct buffered_data *in)
>   	conn->transaction = NULL;
>   }
>   
> +static bool process_delayed_message(struct delayed_request *req)
> +{
> +	struct connection *conn = req->data;
> +	struct buffered_data *saved_in = conn->in;
> +
> +	/*
> +	 * Part of process_message() expects conn->in to contains the
> +	 * processed response. So save the current conn->in and restore it
> +	 * afterwards.
> +	 */
> +	conn->in = req->in;
> +	process_message(req->data, req->in);
> +	conn->in = saved_in;

This pattern was added to do_lu_start() already, and it will be needed
for each other function being called via call_delayed().

Maybe it would be better to add conn explicitly to struct
delayed_request (or even better: replace data with conn) and to do the
conn->in saving/setting/restoring in call_delayed() instead?

Other than that:

Reviewed-by: Juergen Gross <jgross@suse.com>


Juergen

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  parent reply	other threads:[~2021-06-24  8:30 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-16 14:43 [PATCH 00/10] tools/xenstored: Bug fixes + Improve Live-Update Julien Grall
2021-06-16 14:43 ` [PATCH 01/10] MAINTAINERS: Add myself as reviewers for tools/xenstore Julien Grall
2021-06-16 15:15   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 02/10] tools/xenstored: Introduce lu_get_connection() and use it Julien Grall
2021-06-21  8:21   ` Luca Fancellu
2021-06-24  7:21   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 03/10] tools/xenstore: Don't assume conn->in points to the LU request Julien Grall
2021-06-21  8:55   ` Luca Fancellu
2021-06-24  8:06     ` Julien Grall
2021-06-24  7:32   ` Juergen Gross
2021-06-24  7:34     ` Juergen Gross
2021-06-24  7:56       ` Luca Fancellu
2021-06-24  8:05         ` Juergen Gross
2021-06-16 14:43 ` [PATCH 04/10] tools/xenstored: Limit the number of requests a connection can delay Julien Grall
2021-06-21  9:02   ` Luca Fancellu
2021-06-24  7:35   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 05/10] tools/xenstored: xenstored_core.h should include fcntl.h Julien Grall
2021-06-21  9:03   ` Luca Fancellu
2021-06-24  7:36   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 06/10] tools/xenstored: Introduce a wrapper for conn->funcs->can_{read, write} Julien Grall
2021-06-21  9:10   ` Luca Fancellu
2021-06-24  7:39   ` Juergen Gross
2021-06-16 14:43 ` [PATCH 07/10] tools/xenstored: delay_request: don't assume conn->in == in Julien Grall
2021-06-21  9:12   ` Luca Fancellu
2021-06-24  7:44   ` Juergen Gross
2021-06-24  7:58     ` Julien Grall
2021-06-16 14:43 ` [PATCH 08/10] tools/xenstored: Extend restore code to handle multiple input buffer Julien Grall
2021-06-21  9:21   ` Luca Fancellu
2021-06-24  8:30   ` Juergen Gross [this message]
2021-06-24  8:42     ` Julien Grall
2021-06-24  9:20       ` Juergen Gross
2021-06-16 14:43 ` [PATCH 09/10] tools/xenstored: Dump delayed requests Julien Grall
2021-06-21  9:27   ` Luca Fancellu
2021-06-24  8:41   ` Juergen Gross
2021-06-24 10:28     ` Julien Grall
2021-06-24 10:45       ` Juergen Gross
2021-06-24 10:46         ` Julien Grall
2021-06-24 11:02           ` Juergen Gross
2021-06-24 11:17             ` Julien Grall
2021-06-16 14:43 ` [PATCH 10/10] tools/xenstored: Delay new transaction while Live-Update is pending Julien Grall
2021-06-21  9:30   ` Luca Fancellu
2021-06-24  9:23   ` Juergen Gross
2021-06-24 10:43 ` [PATCH 00/10] tools/xenstored: Bug fixes + Improve Live-Update Julien Grall

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