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Date: Tue, 25 Aug 2020 04:53:21 +0000 From: "Zhang, Qiang" <Qiang.Zhang@...driver.com> To: "tglx@...utronix.de" <tglx@...utronix.de>, "elver@...gle.com" <elver@...gle.com>, "longman@...hat.com" <longman@...hat.com> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org> Subject: 回复: [PATCH] debugobjects: install cpu hotplug callback ________________________________________ 发件人: linux-kernel-owner@...r.kernel.org <linux-kernel-owner@...r.kernel.org> 代表 qiang.zhang@...driver.com <qiang.zhang@...driver.com> 发送时间: 2020年8月20日 11:24 收件人: tglx@...utronix.de; elver@...gle.com; longman@...hat.com 抄送: linux-kernel@...r.kernel.org 主题: [PATCH] debugobjects: install cpu hotplug callback From: Zqiang <qiang.zhang@...driver.com> When a cpu going offline, we should free objects in "percpu_obj_pool" free_objs list which corresponding to this cpu. Signed-off-by: Zqiang <qiang.zhang@...driver.com> --- include/linux/cpuhotplug.h | 1 + lib/debugobjects.c | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index a2710e654b64..2e77db655cfa 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -36,6 +36,7 @@ enum cpuhp_state { CPUHP_X86_MCE_DEAD, CPUHP_VIRT_NET_DEAD, CPUHP_SLUB_DEAD, + CPUHP_DEBUG_OBJ_DEAD, CPUHP_MM_WRITEBACK_DEAD, CPUHP_MM_VMSTAT_DEAD, CPUHP_SOFTIRQ_DEAD, diff --git a/lib/debugobjects.c b/lib/debugobjects.c index fe4557955d97..50e21ed0519e 100644 --- a/lib/debugobjects.c +++ b/lib/debugobjects.c @@ -19,6 +19,7 @@ #include <linux/slab.h> #include <linux/hash.h> #include <linux/kmemleak.h> +#include <linux/cpu.h> #define ODEBUG_HASH_BITS 14 #define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS) @@ -433,6 +434,23 @@ static void free_object(struct debug_obj *obj) } } +#if defined(CONFIG_HOTPLUG_CPU) +static int object_cpu_offline(unsigned int cpu) +{ + struct debug_percpu_free *percpu_pool; + struct hlist_node *tmp; + struct debug_obj *obj; + + percpu_pool = per_cpu_ptr(&percpu_obj_pool, cpu); + hlist_for_each_entry_safe(obj, tmp, &percpu_pool->free_objs, node) { + hlist_del(&obj->node); + kmem_cache_free(obj_cache, obj); + } + + return 0; +} +#endif + /* * We run out of memory. That means we probably have tons of objects * allocated. @@ -1367,6 +1385,11 @@ void __init debug_objects_mem_init(void) } else debug_objects_selftest(); +#if defined(CONFIG_HOTPLUG_CPU) + cpuhp_setup_state_nocalls(CPUHP_DEBUG_OBJ_DEAD, "object:offline", NULL, + object_cpu_offline); +#endif + /* * Increase the thresholds for allocating and freeing objects * according to the number of possible CPUs available in the system. -- 2.17.1
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