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b=BQG5QlckHEHyiAAX6helwYcS4V/BH/xIjs9yrntAOiUJeU1PyVnqK47jpolQB8xiGCl7Zg HF1np1ayrdYwkpU0f95+c4/0Afl6ze4BdqLN6H2J5vq4KvOlSVgvdpG1zZC2E8g5Cf2j7Y eIq1ShwduaI59ymFPoxpyrsfCusVNi4= Received: from imap2.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap2.dmz-prg2.suse.org (Postfix) with ESMTPS id 6969E13AAE; Fri, 5 Apr 2024 17:05:51 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap2.dmz-prg2.suse.org with ESMTPSA id aBEEGW8vEGYteAAAn2gu4w (envelope-from ); Fri, 05 Apr 2024 17:05:51 +0000 From: =?utf-8?q?Michal_Koutn=C3=BD?= To: cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Tejun Heo , Zefan Li , Johannes Weiner , Jonathan Corbet , Shuah Khan Subject: [RFC PATCH v3 4/9] cgroup/pids: Add pids.events.local Date: Fri, 5 Apr 2024 19:05:43 +0200 Message-ID: <20240405170548.15234-5-mkoutny@suse.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240405170548.15234-1-mkoutny@suse.com> References: <20240405170548.15234-1-mkoutny@suse.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Level: X-Spamd-Result: default: False [-0.53 / 50.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; BAYES_HAM(-0.02)[53.81%]; MX_GOOD(-0.01)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:98:from]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; TO_DN_SOME(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_TLS_ALL(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RLfcexjtczxtbnj559fj95g6y7)]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_SEVEN(0.00)[9]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:dkim,suse.com:email,imap2.dmz-prg2.suse.org:helo,imap2.dmz-prg2.suse.org:rdns]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; DKIM_TRACE(0.00)[suse.com:+] X-Spam-Flag: NO X-Spam-Score: -0.53 X-Spamd-Bar: / X-Rspamd-Queue-Id: 9735A21AC1 X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action Hierarchical counting of events is not practical for watching when a particular pids.max is being hit. Therefore introduce .local flavor of events file (akin to memory controller) that collects only events relevant to given cgroup. Signed-off-by: Michal Koutný --- kernel/cgroup/pids.c | 41 +++++++++++++++++++++++++++++++++-------- 1 file changed, 33 insertions(+), 8 deletions(-) diff --git a/kernel/cgroup/pids.c b/kernel/cgroup/pids.c index 76c0a97e42da..f5f81274658e 100644 --- a/kernel/cgroup/pids.c +++ b/kernel/cgroup/pids.c @@ -57,10 +57,12 @@ struct pids_cgroup { atomic64_t limit; int64_t watermark; - /* Handle for "pids.events" */ + /* Handles for pids.events[.local] */ struct cgroup_file events_file; + struct cgroup_file events_local_file; atomic64_t events[NR_PIDCG_EVENTS]; + atomic64_t events_local[NR_PIDCG_EVENTS]; }; static struct pids_cgroup *css_pids(struct cgroup_subsys_state *css) @@ -245,11 +247,12 @@ static void pids_event(struct pids_cgroup *pids_forking, bool limit = false; /* Only log the first time limit is hit. */ - if (atomic64_inc_return(&p->events[PIDCG_MAX_IMPOSED]) == 1) { + if (atomic64_inc_return(&p->events_local[PIDCG_MAX_IMPOSED]) == 1) { pr_info("cgroup: fork rejected by pids controller in "); pr_cont_cgroup_path(p->css.cgroup); pr_cont("\n"); } + cgroup_file_notify(&p->events_local_file); /* Events are only notified in pids_forking on v1 */ if (!cgroup_subsys_on_dfl(pids_cgrp_subsys)) return; @@ -257,8 +260,11 @@ static void pids_event(struct pids_cgroup *pids_forking, for (; parent_pids(p); p = parent_pids(p)) { atomic64_inc(&p->events[PIDCG_MAX_IMPOSED]); - if (p == pids_over_limit) + if (p == pids_over_limit) { limit = true; + atomic64_inc(&p->events_local[PIDCG_MAX]); + cgroup_file_notify(&p->events_local_file); + } if (limit) atomic64_inc(&p->events[PIDCG_MAX]); @@ -368,12 +374,25 @@ static s64 pids_peak_read(struct cgroup_subsys_state *css, return READ_ONCE(pids->watermark); } -static int pids_events_show(struct seq_file *sf, void *v) +static int __pids_events_show(struct seq_file *sf, bool local) { struct pids_cgroup *pids = css_pids(seq_css(sf)); + atomic64_t *events = local ? pids->events_local : pids->events; + + seq_printf(sf, "max %lld\n", (s64)atomic64_read(&events[PIDCG_MAX])); + seq_printf(sf, "max.imposed %lld\n", (s64)atomic64_read(&events[PIDCG_MAX_IMPOSED])); + return 0; +} + +static int pids_events_show(struct seq_file *sf, void *v) +{ + __pids_events_show(sf, false); + return 0; +} - seq_printf(sf, "max %lld\n", (s64)atomic64_read(&pids->events[PIDCG_MAX])); - seq_printf(sf, "max.imposed %lld\n", (s64)atomic64_read(&pids->events[PIDCG_MAX_IMPOSED])); +static int pids_events_local_show(struct seq_file *sf, void *v) +{ + __pids_events_show(sf, true); return 0; } @@ -381,7 +400,7 @@ static int pids_events_show_legacy(struct seq_file *sf, void *v) { struct pids_cgroup *pids = css_pids(seq_css(sf)); - seq_printf(sf, "max%lld\n", (s64)atomic64_read(&pids->events[PIDCG_MAX_IMPOSED])); + seq_printf(sf, "max%lld\n", (s64)atomic64_read(&pids->events_local[PIDCG_MAX_IMPOSED])); return 0; } @@ -408,6 +427,12 @@ static struct cftype pids_files[] = { .file_offset = offsetof(struct pids_cgroup, events_file), .flags = CFTYPE_NOT_ON_ROOT, }, + { + .name = "events.local", + .seq_show = pids_events_local_show, + .file_offset = offsetof(struct pids_cgroup, events_file), + .flags = CFTYPE_NOT_ON_ROOT, + }, { } /* terminate */ }; @@ -426,7 +451,7 @@ static struct cftype pids_files_legacy[] = { { .name = "events", .seq_show = pids_events_show_legacy, - .file_offset = offsetof(struct pids_cgroup, events_file), + .file_offset = offsetof(struct pids_cgroup, events_local_file), .flags = CFTYPE_NOT_ON_ROOT, }, { } /* terminate */