Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1owqS6-0008Cp-FY for pgsql-committers@arkaria.postgresql.org; Sun, 20 Nov 2022 19:58:06 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1owqR7-0002vU-DM for pgsql-committers@arkaria.postgresql.org; Sun, 20 Nov 2022 19:57:05 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1owqR7-0002vK-6l for pgsql-committers@lists.postgresql.org; Sun, 20 Nov 2022 19:57:05 +0000 Received: from mahout.postgresql.org ([2001:4800:3e1:1::227]) by makus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1owqR4-0003ec-Np for pgsql-committers@lists.postgresql.org; Sun, 20 Nov 2022 19:57:04 +0000 Received: from gemulon.postgresql.org ([2001:4800:3e1:1::198]) by mahout.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1owqR4-0002Ik-8b for pgsql-committers@lists.postgresql.org; Sun, 20 Nov 2022 19:57:02 +0000 Received: from localhost ([127.0.0.1] helo=gemulon.postgresql.org) by gemulon.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1owqR2-0007My-Lk for pgsql-committers@lists.postgresql.org; Sun, 20 Nov 2022 19:57:01 +0000 Content-Type: multipart/mixed; boundary="===============9138840787309220140==" MIME-Version: 1.0 From: Andres Freund To: pgsql-committers@lists.postgresql.org Subject: pgsql: lwlock: Fix quadratic behavior with very long wait lists X-Auto-Response-Suppress: All Auto-Submitted: auto-generated Message-Id: Date: Sun, 20 Nov 2022 19:57:01 +0000 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --===============9138840787309220140== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 bHdsb2NrOiBGaXggcXVhZHJhdGljIGJlaGF2aW9yIHdpdGggdmVyeSBsb25nIHdhaXQgbGlzdHMK ClVudGlsIG5vdyBMV0xvY2tEZXF1ZXVlU2VsZigpIHNlcXVlbnRpYWxseSBzZWFyY2hlZCB0aGUg bGlzdCBvZiB3YWl0ZXJzIHRvIHNlZQppZiB0aGUgY3VycmVudCBwcm9jIGlzIHN0aWxsIGlzIG9u IHRoZSBsaXN0IG9mIHdhaXRlcnMsIG9yIGhhcyBhbHJlYWR5IGJlZW4KcmVtb3ZlZC4gSW4gZXh0 cmVtZSB3b3JrbG9hZHMsIHdoZXJlIHRoZSB3YWl0IGxpc3RzIGFyZSB2ZXJ5IGxvbmcsIHRoaXMg bGVhZHMKdG8gYSBxdWFkcmF0aWMgYmVoYXZpb3IuICNiYWNrZW5kcyBpdGVyYXRpbmcgb3ZlciBh IGxpc3QgI2JhY2tlbmRzCmxvbmcuIEFkZGl0aW9uYWxseSwgdGhlIGxpa2VsaWhvb2Qgb2YgbmVl ZGluZyB0byBjYWxsIExXTG9ja0RlcXVldWVTZWxmKCkgaW4KdGhlIGZpcnN0IHBsYWNlIGFsc28g aW5jcmVhc2VzIHdpdGggdGhlIGluY3JlYXNlZCBsZW5ndGggb2YgdGhlIHdhaXQgcXVldWUsIGFz Cml0IGJlY29tZXMgbW9yZSBsaWtlbHkgdGhhdCBhIGxvY2sgaXMgcmVsZWFzZWQgd2hpbGUgd2Fp dGluZyBmb3IgdGhlIHdhaXQgbGlzdApsb2NrLCB3aGljaCBpcyBoZWxkIGZvciBsb25nZXIgZHVy aW5nIGxvY2sgcmVsZWFzZS4KCkR1ZSB0byB0aGUgZXhwb25lbnRpYWwgYmFjay1vZmYgaW4gcGVy Zm9ybV9zcGluX2RlbGF5KCkgdGhpcyBpcyBzdXJwcmlzaW5nbHkKaGFyZCB0byBkZXRlY3QuIFdl IHNob3VsZCBtYWtlIHRoYXQgZWFzaWVyLCBlLmcuIGJ5IGFkZGluZyBhIHdhaXQgZXZlbnQgYXJv dW5kCnRoZSBwZ191c2xlZXAoKSAtIGJ1dCB0aGF0J3MgYSBzZXBhcmF0ZSBwYXRjaC4KClRoZSBm aXggaXMgc2ltcGxlIC0gdHJhY2sgd2hldGhlciBhIHByb2MgaXMgY3VycmVudGx5IHdhaXRpbmcg aW4gdGhlIHdhaXQgbGlzdApvciBhbHJlYWR5IHJlbW92ZWQgYnV0IHdhaXRpbmcgdG8gYmUgd29r ZW4gdXAgaW4gUEdQUk9DLT5sd1dhaXRpbmcuCgpJbiBzb21lIHdvcmtsb2FkcyB3aXRoIGEgbG90 IG9mIGNsaWVudHMgY29udGVuZGluZyBmb3IgYSBzbWFsbCBudW1iZXIgb2YKbHdsb2NrcyAoZS5n LiBXQUxXcml0ZUxvY2spLCB0aGUgZml4IGNhbiBzdWJzdGFudGlhbGx5IGluY3JlYXNlIHRocm91 Z2hwdXQuCgpBcyB0aGUgcXVhZHJhdGljIGJlaGF2aW9yIGFyZ3VhYmx5IGlzIGEgYnVnLCB3ZSBt aWdodCB3YW50IHRvIGRlY2lkZSB0bwpiYWNrcGF0Y2ggdGhpcyBmaXggaW4gdGhlIGZ1dHVyZS4K CkF1dGhvcjogQW5kcmVzIEZyZXVuZCA8YW5kcmVzQGFuYXJhemVsLmRlPgpSZXZpZXdlZC1ieTog QmhhcmF0aCBSdXBpcmVkZHkgPGJoYXJhdGgucnVwaXJlZGR5Zm9ycG9zdGdyZXNAZ21haWwuY29t PgpEaXNjdXNzaW9uOiBodHRwczovL3Bvc3Rnci5lcy9tLzIwMjIxMDI3MTY1OTE0LjJob2Z6cDRj dnV0ajZnaW5AYXdvcmszLmFuYXJhemVsLmRlCkRpc2N1c3Npb246IGh0dHBzOi8vcG9zdGdyLmVz L20vQ0FMajJBQ1hrdE5iRz1LOFhpN1BTcWJvZlRab3phdmhheGphdFZjMTRpWWFMdTRNYWFnQG1h aWwuZ21haWwuY29tCgpCcmFuY2gKLS0tLS0tCm1hc3RlcgoKRGV0YWlscwotLS0tLS0tCmh0dHBz Oi8vZ2l0LnBvc3RncmVzcWwub3JnL3BnL2NvbW1pdGRpZmYvYTRhZGMzMWY2OTAyZjZmYzI5ZDc0 ODY4ZTg5Njk0MTJmYzU5MGRhOQoKTW9kaWZpZWQgRmlsZXMKLS0tLS0tLS0tLS0tLS0Kc3JjL2Jh Y2tlbmQvYWNjZXNzL3RyYW5zYW0vdHdvcGhhc2UuYyB8ICAyICstCnNyYy9iYWNrZW5kL3N0b3Jh Z2UvbG1nci9sd2xvY2suYyAgICAgfCA1MyArKysrKysrKysrKysrKysrKysrKy0tLS0tLS0tLS0t LS0tLQpzcmMvYmFja2VuZC9zdG9yYWdlL2xtZ3IvcHJvYy5jICAgICAgIHwgIDQgKy0tCnNyYy9p bmNsdWRlL3N0b3JhZ2UvbHdsb2NrLmggICAgICAgICAgfCAgOCArKysrKysKc3JjL2luY2x1ZGUv c3RvcmFnZS9wcm9jLmggICAgICAgICAgICB8ICAyICstCjUgZmlsZXMgY2hhbmdlZCwgNDIgaW5z ZXJ0aW9ucygrKSwgMjcgZGVsZXRpb25zKC0pCgo= --===============9138840787309220140==--