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xen
23585-xenpaging_correct_dropping_of_pages_to_av...
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File 23585-xenpaging_correct_dropping_of_pages_to_avoid_full_ring_buffer.patch of Package xen
changeset: 23585:b4d18ac00a46 user: Olaf Hering <olaf@aepfle.de> date: Fri Jun 10 10:47:14 2011 +0200 files: tools/xenpaging/xenpaging.c description: xenpaging: correct dropping of pages to avoid full ring buffer Doing a one-way channel from Xen to xenpaging is not possible with the current ring buffer implementation. xenpaging uses the mem_event ring buffer, which expects request/response pairs to make progress. The previous patch, which tried to establish a one-way communication from Xen to xenpaging, stalled the guest once the buffer was filled up with requests. Correct page-dropping by taking the slow path and let p2m_mem_paging_resume() consume the response from xenpaging. This makes room for yet another request/response pair and avoids hanging guests. Signed-off-by: Olaf Hering <olaf@aepfle.de> Committed-by: Ian Jackson <ian.jackson.citrix.com> --- tools/xenpaging/xenpaging.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) Index: xen-4.1.2-testing/tools/xenpaging/xenpaging.c =================================================================== --- xen-4.1.2-testing.orig/tools/xenpaging/xenpaging.c +++ xen-4.1.2-testing/tools/xenpaging/xenpaging.c @@ -690,19 +690,19 @@ int main(int argc, char *argv[]) ERROR("Error populating page"); goto out; } + } - /* Prepare the response */ - rsp.gfn = req.gfn; - rsp.p2mt = req.p2mt; - rsp.vcpu_id = req.vcpu_id; - rsp.flags = req.flags; + /* Prepare the response */ + rsp.gfn = req.gfn; + rsp.p2mt = req.p2mt; + rsp.vcpu_id = req.vcpu_id; + rsp.flags = req.flags; - rc = xenpaging_resume_page(paging, &rsp, 1); - if ( rc != 0 ) - { - ERROR("Error resuming page"); - goto out; - } + rc = xenpaging_resume_page(paging, &rsp, 1); + if ( rc != 0 ) + { + ERROR("Error resuming page"); + goto out; } /* Evict a new page to replace the one we just paged in */
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