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Tsirkin" , David Hildenbrand , Andrew Morton Cc: kernel@openvz.org, Alexander Atanasov , virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v2 2/4] Enable balloon drivers to report inflated memory Date: Tue, 16 Aug 2022 12:41:15 +0300 Message-Id: <20220816094117.3144881-3-alexander.atanasov@virtuozzo.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220816094117.3144881-1-alexander.atanasov@virtuozzo.com> References: <20220816094117.3144881-1-alexander.atanasov@virtuozzo.com> MIME-Version: 1.0 ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=none; spf=pass (imf20.hostedemail.com: domain of alexander.atanasov@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=alexander.atanasov@virtuozzo.com; dmarc=pass (policy=quarantine) header.from=virtuozzo.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1660642945; a=rsa-sha256; cv=none; b=7UrxuFTKb5MxCuzYpEZ92F3WhtSPF10kX8US89CagtQmmBL5btBoDpcZcOkgaurnrqZSFx u4BAQmPp1m1JHAsbCX5s+DXcXXsGz8ZOhWfQz88TkfCeDYMvMxEtDDX+GZg4y19JdNEjjp 82RkejIDgRDDUFmUOs/ciZKA2V2ztl8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1660642945; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=H7zj1q+fUjV0R6GsuXwaIWs1xK+MvvcLibCpCZApSm0=; b=BEU/pm+lrsJxJ5ylg80vb/NRYcZZS9qoq+NmcUWai/MOpiPvxvv3iNNhJIqKlOyWXQ+xwE Smc4NweALejPtRVzslhwBcmaaJpAHem+d71coLaXs01HvBjX2Q/Ro6GEjJU2QN9nCrkzaK vKCcZ2p8rMuAeCbrj3+lATpbrPJiw04= X-Stat-Signature: cptdaickcbmkfosn3szbx9fkozpjwu96 X-Rspamd-Queue-Id: 8FEAC1C01A7 X-Rspamd-Server: rspam08 Authentication-Results: imf20.hostedemail.com; dkim=none; spf=pass (imf20.hostedemail.com: domain of alexander.atanasov@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=alexander.atanasov@virtuozzo.com; dmarc=pass (policy=quarantine) header.from=virtuozzo.com X-Rspam-User: X-HE-Tag: 1660642943-438697 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add counters to be updated by the balloon drivers. Create balloon notifier to propagate changes. Signed-off-by: Alexander Atanasov --- include/linux/balloon_common.h | 18 ++++++++++++++++++ mm/balloon_common.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/include/linux/balloon_common.h b/include/linux/balloon_common.h index a45e9fd76235..e707f57f58da 100644 --- a/include/linux/balloon_common.h +++ b/include/linux/balloon_common.h @@ -59,6 +59,24 @@ struct balloon_dev_info { struct page *page, enum migrate_mode mode); }; +extern atomic_long_t mem_balloon_inflated_total_kb; +extern atomic_long_t mem_balloon_inflated_free_kb; + +void balloon_set_inflated_total(long inflated_kb); +void balloon_set_inflated_free(long inflated_kb); + +#define BALLOON_CHANGED_TOTAL 0 +#define BALLOON_CHANGED_FREE 1 + +extern int register_balloon_notifier(struct notifier_block *nb); +extern void unregister_balloon_notifier(struct notifier_block *nb); + +#define balloon_notifier(fn, pri) ({ \ + static struct notifier_block fn##_mem_nb __meminitdata =\ + { .notifier_call = fn, .priority = pri }; \ + register_balloon_notifier(&fn##_mem_nb); \ +}) + extern struct page *balloon_page_alloc(void); extern void balloon_page_enqueue(struct balloon_dev_info *b_dev_info, struct page *page); diff --git a/mm/balloon_common.c b/mm/balloon_common.c index 54ed98653c78..abeee6882649 100644 --- a/mm/balloon_common.c +++ b/mm/balloon_common.c @@ -9,8 +9,42 @@ #include #include #include +#include #include +atomic_long_t mem_balloon_inflated_total_kb = ATOMIC_LONG_INIT(0); +atomic_long_t mem_balloon_inflated_free_kb = ATOMIC_LONG_INIT(0); +SRCU_NOTIFIER_HEAD_STATIC(balloon_chain); + +int register_balloon_notifier(struct notifier_block *nb) +{ + return srcu_notifier_chain_register(&balloon_chain, nb); +} +EXPORT_SYMBOL(register_balloon_notifier); + +void unregister_balloon_notifier(struct notifier_block *nb) +{ + srcu_notifier_chain_unregister(&balloon_chain, nb); +} +EXPORT_SYMBOL(unregister_balloon_notifier); + +static int balloon_notify(unsigned long val) +{ + return srcu_notifier_call_chain(&balloon_chain, val, NULL); +} + +void balloon_set_inflated_total(long inflated_kb) +{ + atomic_long_set(&mem_balloon_inflated_total_kb, inflated_kb); + balloon_notify(BALLOON_CHANGED_TOTAL); +} + +void balloon_set_inflated_free(long inflated_kb) +{ + atomic_long_set(&mem_balloon_inflated_free_kb, inflated_kb); + balloon_notify(BALLOON_CHANGED_FREE); +} + static void balloon_page_enqueue_one(struct balloon_dev_info *b_dev_info, struct page *page) {