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Sat, 16 Aug 2025 04:22:01 -0700 (PDT) From: Bernhard Kaindl To: xen-devel@lists.xenproject.org Cc: Bernhard Kaindl , Andrew Cooper , Anthony PERARD , Michal Orzel , Jan Beulich , Julien Grall , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Stefano Stabellini , Alejandro Vallejo Subject: [PATCH v2 3/7] xen/page_alloc: Add static per-NUMA-node counts of free pages Date: Sat, 16 Aug 2025 13:19:29 +0200 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1755343873462124100 Content-Type: text/plain; charset="utf-8" The static per-NUMA-node count of free pages is the sum of free memory in all zones of a node. It's an optimisation to avoid doing that operation frequently in the following patches that introduce per-NUMA-node claims. --- Changed since v1: - Added ASSERT(per_node_avail_pages[node] >=3D request) as requested during review by Roger: Comment by me: As we have ASSERT(avail[node][zone] >=3D request); directly before it, request is already valid, so this checks that per_node_avail_pages[node] is not mis-accounted too low. Signed-off-by: Bernhard Kaindl Signed-off-by: Alejandro Vallejo --- xen/common/page_alloc.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index 7e90b9cc1e..43de9296fd 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -486,6 +486,9 @@ static unsigned long node_need_scrub[MAX_NUMNODES]; static unsigned long *avail[MAX_NUMNODES]; static long total_avail_pages; =20 +/* Per-NUMA-node counts of free pages */ +static unsigned long per_node_avail_pages[MAX_NUMNODES]; + static DEFINE_SPINLOCK(heap_lock); static long outstanding_claims; /* total outstanding claims by all domains= */ =20 @@ -1066,6 +1069,8 @@ static struct page_info *alloc_heap_pages( =20 ASSERT(avail[node][zone] >=3D request); avail[node][zone] -=3D request; + ASSERT(per_node_avail_pages[node] >=3D request); + per_node_avail_pages[node] -=3D request; total_avail_pages -=3D request; ASSERT(total_avail_pages >=3D 0); =20 @@ -1226,6 +1231,8 @@ static int reserve_offlined_page(struct page_info *he= ad) continue; =20 avail[node][zone]--; + ASSERT(per_node_avail_pages[node] > 0); + per_node_avail_pages[node]--; total_avail_pages--; ASSERT(total_avail_pages >=3D 0); =20 @@ -1550,6 +1557,7 @@ static void free_heap_pages( } =20 avail[node][zone] +=3D 1 << order; + per_node_avail_pages[node] +=3D 1 << order; total_avail_pages +=3D 1 << order; if ( need_scrub ) { --=20 2.43.0