Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1v6Xkz-006C6M-N2 for pgsql-committers@arkaria.postgresql.org; Wed, 08 Oct 2025 17:15:17 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1v6Xkx-00BlUz-Da for pgsql-committers@arkaria.postgresql.org; Wed, 08 Oct 2025 17:15:16 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1v6Xkx-00BlUr-6S for pgsql-committers@lists.postgresql.org; Wed, 08 Oct 2025 17:15:16 +0000 Received: from mahout.postgresql.org ([2001:4800:3e1:1::227]) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1v6Xku-0014St-26 for pgsql-committers@lists.postgresql.org; Wed, 08 Oct 2025 17:15:15 +0000 Received: from gemulon.postgresql.org ([2001:4800:3e1:1::198]) by mahout.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1v6Xkt-001yRT-1H for pgsql-committers@lists.postgresql.org; Wed, 08 Oct 2025 17:15:11 +0000 Received: from localhost ([127.0.0.1] helo=gemulon.postgresql.org) by gemulon.postgresql.org with esmtp (Exim 4.96) (envelope-from ) id 1v6Xks-000hve-2C for pgsql-committers@lists.postgresql.org; Wed, 08 Oct 2025 17:15:10 +0000 Content-Type: multipart/mixed; boundary="===============1830603318194668954==" MIME-Version: 1.0 From: Andres Freund To: pgsql-committers@lists.postgresql.org Subject: pgsql: Improve ReadRecentBuffer() scalability X-Auto-Response-Suppress: All Auto-Submitted: auto-generated Message-Id: Date: Wed, 08 Oct 2025 17:15:10 +0000 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --===============1830603318194668954== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 SW1wcm92ZSBSZWFkUmVjZW50QnVmZmVyKCkgc2NhbGFiaWxpdHkKCldoaWxlIHRlc3RpbmcgYSBu ZXcgcG90ZW50aWFsIHVzZSBmb3IgUmVhZFJlY2VudEJ1ZmZlcigpLCBBbmRyZXMKcmVwb3J0ZWQg dGhhdCBpdCBzY2FsZXMgYmFkbHkgd2hlbiBjYWxsZWQgY29uY3VycmVudGx5IGZvciB0aGUgc2Ft ZQpidWZmZXIgYnkgbWFueSBiYWNrZW5kcy4gIEluc3RlYWQgb2YgYSBuYWl2ZSAoYnV0IHdyb25n KSBjb2Rpbmcgd2l0aApQaW5CdWZmZXIoKSwgaXQgdXNlZCB0aGUgc3BpbmxvY2ssIHNvIHRoYXQg aXQgY291bGQgYmUgY2FyZWZ1bCB0byBwaW4Kb25seSBpZiB0aGUgYnVmZmVyIHdhcyB2YWxpZCBh bmQgaG9sZGluZyB0aGUgZXhwZWN0ZWQgYmxvY2ssIHRvIGF2b2lkCmJyZWFraW5nIGludmFyaWFu dHMgaW4gZWcgR2V0VmljdGltQnVmZmVyKCkuICBVbmZvcnR1bmF0ZWx5IHRoYXQgbWFkZSBpdAps ZXNzIHNjYWxhYmxlIHRoYW4gUGluQnVmZmVyKCksIHdoaWNoIHVzZXMgY29tcGFyZS1leGNoYW5n ZSBpbnN0ZWFkLgoKV2UgY2FuIGZpeCB0aGF0IGJ5IGdpdmluZyBQaW5CdWZmZXIoKSBhIG5ldyBz a2lwX2lmX25vdF92YWxpZCBtb2RlIHRoYXQKZG9lc24ndCBwaW4gaW52YWxpZCBidWZmZXJzLiAg SXQgbWlnaHQgb2NjYXNpb25hbGx5IHNraXAgd2hlbiBpdApzaG91bGRuJ3QgZHVlIHRvIHRoZSB1 bmxvY2tlZCByZWFkIG9mIHRoZSBoZWFkZXIgZmxhZ3MsIGJ1dCB0aGF0J3MKdW5saWtlbHkgYW5k IHBlcmZlY3RseSBhY2NlcHRhYmxlIGZvciBhbiBvcHBvcnR1bmlzdGljIG9wdGltaXNhdGlvbgpy b3V0aW5lLCBhbmQgaXQgY2FuIG9ubHkgc3VjY2VlZCB3aGVuIGl0IHJlYWxseSBzaG91bGQgZHVl IHRvIHRoZQpjb21wYXJlLWV4Y2hhbmdlIGxvb3AuCgpOb3RlIHRoYXQgdGhpcyBmaXhlcyBSZWFk UmVjZW50QnVmZmVyKCkncyBmYWlsdXJlIHRvIGJ1bXAgdGhlIHVzYWdlCmNvdW50LiBXaGlsZSB0 aGlzIGNvdWxkIGJlIHNlZW4gYXMgYSBidWcsIHRoZXJlIGN1cnJlbnRseSBhcmVuJ3QgY2FzZXMK YWZmZWN0ZWQgYnkgdGhpcyBpbiBjb3JlLCBzbyBpdCBkb2Vzbid0IHNlZW0gd29ydGggYmFja3Bh dGNoaW5nIHRoYXQgcG9ydGlvbi4KCkF1dGhvcjogVGhvbWFzIE11bnJvIDx0aG9tYXMubXVucm9A Z21haWwuY29tPgpSZXBvcnRlZC1ieTogQW5kcmVzIEZyZXVuZCA8YW5kcmVzQGFuYXJhemVsLmRl PgpSZXZpZXdlZC1ieTogQW5kcmVzIEZyZXVuZCA8YW5kcmVzQGFuYXJhemVsLmRlPgpSZXZpZXdl ZC1ieTogTWF0dGhpYXMgdmFuIGRlIE1lZW50IDxib2VrZXd1cm0rcG9zdGdyZXNAZ21haWwuY29t PgpEaXNjdXNzaW9uOiBodHRwczovL3Bvc3Rnci5lcy9tLzIwMjMwNjI3MDIwNTQ2LnQ2ejR0bnRt ajd3bWpyZmglNDBhd29yazMuYW5hcmF6ZWwuZGUKRGlzY3Vzc2lvbjogaHR0cHM6Ly9wb3N0Z3Iu ZXMvbS9mdmZta3I1a2s0bnlleDU2ZWpneGozdXppNjNpc2Z4b3ZwMmJpZWNiNGJzcGJqcnplN0Bh ejJwbGphYmhuZmYKCkJyYW5jaAotLS0tLS0KbWFzdGVyCgpEZXRhaWxzCi0tLS0tLS0KaHR0cHM6 Ly9naXQucG9zdGdyZXNxbC5vcmcvcGcvY29tbWl0ZGlmZi84MTlkYzExOGMwZjZjZDFmYzA4ZjBl ODA3NzAyYjRiYzBiMGQ4NzMzCgpNb2RpZmllZCBGaWxlcwotLS0tLS0tLS0tLS0tLQpzcmMvYmFj a2VuZC9zdG9yYWdlL2J1ZmZlci9idWZtZ3IuYyB8IDY0ICsrKysrKysrKysrKysrKystLS0tLS0t LS0tLS0tLS0tLS0tLS0KMSBmaWxlIGNoYW5nZWQsIDI4IGluc2VydGlvbnMoKyksIDM2IGRlbGV0 aW9ucygtKQoK --===============1830603318194668954==--