From: Ian Jackson <ian.jackson@citrix.com>
To: Anthony PERARD <anthony.perard@citrix.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
Wei Liu <wl@xen.org>
Subject: Re: [Xen-devel] [PATCH v2 6/9] libxl_disk: Cut libxl_cdrom_insert into steps ..
Date: Tue, 17 Sep 2019 17:20:09 +0100 [thread overview]
Message-ID: <23937.1977.641708.328884@mariner.uk.xensource.com> (raw)
In-Reply-To: <20190614103801.22619-7-anthony.perard@citrix.com>
Anthony PERARD writes ("[PATCH v2 6/9] libxl_disk: Cut libxl_cdrom_insert into steps .."):
> .. and use a new "slow" lock to avoid holding the userdata lock across
> several functions.
>
> This patch cuts libxl_cdrom_insert into different step/function but
> there are still called synchronously. (Taking the ev_lock is the only
> step that might be asynchronous.) A later patch will call them
> asynchronously when QMP is involved.
>
> Thee userdata lock (json_lock) use to protect against concurrent change
> of cdrom is replaced by an ev_lock which can be held across different
> CTX_LOCK sections. The json_lock is still used when reading/modifying
> the domain userdata (mandatory) and update xenstore (mostly because
> it's updated as the same time as the userdata).
>
> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
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next prev parent reply other threads:[~2019-09-17 16:21 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-14 10:37 [Xen-devel] [PATCH v2 0/9] libxl: New slow lock + fix libxl_cdrom_insert with QEMU depriv Anthony PERARD
2019-06-14 10:37 ` [Xen-devel] [PATCH v2 1/9] libxl_internal: Remove lost comment Anthony PERARD
2019-06-14 10:37 ` [Xen-devel] [PATCH v2 2/9] libxl: Pointer on usage of libxl__domain_userdata_lock Anthony PERARD
2019-06-14 10:37 ` [Xen-devel] [PATCH v2 3/9] libxl_internal: Introduce libxl__ev_lock for devices hotplug via QMP Anthony PERARD
2019-09-17 15:44 ` Ian Jackson
2019-09-18 9:59 ` Anthony PERARD
2019-09-18 10:39 ` Ian Jackson
2019-06-14 10:37 ` [Xen-devel] [PATCH v2 4/9] libxl: Add optimisation to ev_lock Anthony PERARD
2019-09-17 15:49 ` Ian Jackson
2019-06-14 10:37 ` [Xen-devel] [PATCH v2 5/9] libxl_disk: Reorganise libxl_cdrom_insert Anthony PERARD
2019-06-14 10:37 ` [Xen-devel] [PATCH v2 6/9] libxl_disk: Cut libxl_cdrom_insert into steps Anthony PERARD
2019-09-17 16:20 ` Ian Jackson [this message]
2019-06-14 10:37 ` [Xen-devel] [PATCH v2 7/9] libxl_disk: Implement missing timeout for libxl_cdrom_insert Anthony PERARD
2019-06-14 10:38 ` [Xen-devel] [PATCH v2 8/9] libxl: Move qmp_parameters_* prototypes to libxl_internal.h Anthony PERARD
2019-06-14 10:38 ` [Xen-devel] [PATCH v2 9/9] libxl_disk: Use ev_qmp in libxl_cdrom_insert Anthony PERARD
2019-09-17 16:22 ` [Xen-devel] [PATCH v2 0/9] libxl: New slow lock + fix libxl_cdrom_insert with QEMU depriv Ian Jackson
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