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d="scan'208";a="2180712" From: Andrew Cooper To: Xen-devel Date: Mon, 24 Jun 2019 19:01:27 +0100 Message-ID: <20190624180128.5328-1-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Subject: [Xen-devel] [PATCH] page-alloc: Clamp get_free_buddy() to online nodes X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Wei Liu , George Dunlap , Andrew Cooper , Julien Grall , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" d->node_affinity defaults to NODE_MASK_ALL which has bits set outside of node_online_map. This in turn causes the loop in get_free_buddy() to waste effort iterating over offline nodes. Always clamp d->node_affinity to node_online_map when in use. This in turn involves implementing nodes_copy() which was previously missin= g. Signed-off-by: Andrew Cooper Reviewed-by: Jan Beulich --- CC: Jan Beulich CC: Wei Liu CC: Roger Pau Monn=C3=A9 CC: Stefano Stabellini CC: Julien Grall CC: George Dunlap This patch hides the issue identified in the "UBSAN report in find_next_bit= ()" so probably doesn't want applying until that is resolved. A lower overhead option would be to do: nodes_and(nodemask, node_online_map, d ? d->node_affinity : node_online_map= ); however this doesn't work because the nodeset_t API has a hidden &(param) throughout the API. I've got half a mind to undo this nonsense and have nodemask_t work in exactly the same way as cpumask_t. --- xen/common/page_alloc.c | 7 ++++++- xen/include/xen/nodemask.h | 6 ++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index 7825fd8c42..cec1b15d5b 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -811,11 +811,16 @@ static struct page_info *get_free_buddy(unsigned int = zone_lo, const struct domain *d) { nodeid_t first_node, node =3D MEMF_get_node(memflags), req_node =3D no= de; - nodemask_t nodemask =3D d ? d->node_affinity : node_online_map; + nodemask_t nodemask; unsigned int j, zone, nodemask_retry =3D 0; struct page_info *pg; bool use_unscrubbed =3D (memflags & MEMF_no_scrub); =20 + /* Clamp nodemask to node_online_map and optionally d->node_affinity. = */ + nodes_copy(nodemask, node_online_map); + if ( d ) + nodes_and(nodemask, nodemask, d->node_affinity); + if ( node =3D=3D NUMA_NO_NODE ) { if ( d !=3D NULL ) diff --git a/xen/include/xen/nodemask.h b/xen/include/xen/nodemask.h index e287399352..e83cfe2439 100644 --- a/xen/include/xen/nodemask.h +++ b/xen/include/xen/nodemask.h @@ -189,6 +189,12 @@ static inline int __nodes_weight(const nodemask_t *src= p, int nbits) return bitmap_weight(srcp->bits, nbits); } =20 +#define nodes_copy(dst, src) __nodes_copy(&(dst), &(src)) +static inline void __nodes_copy(nodemask_t *dst, nodemask_t *src) +{ + return bitmap_copy(dst->bits, src->bits, MAX_NUMNODES); +} + #define nodes_shift_right(dst, src, n) \ __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES) static inline void __nodes_shift_right(nodemask_t *dstp, --=20 2.11.0 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel