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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonathan Corbet , Shuah Khan , Randy Dunlap , Brendan Jackman , Johannes Weiner , Zi Yan , linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Zhen Ni Subject: [PATCH v3 2/8] mm/page_owner: Add TGID filtering support Date: Mon, 7 Sep 2026 16:26:14 +0800 Message-Id: <20260907082620.2083838-3-zhen.ni@easystack.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20260907082620.2083838-1-zhen.ni@easystack.cn> References: <20260907082620.2083838-1-zhen.ni@easystack.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-HM-Tid: 0aa07afa0c990229kunm225d16da162cf0 X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFJQjdXWRgWCB1ZQUpXWS1ZQUlXWQ8JGhUIEh9ZQVlCGR9KVklJHh1JQktDGExISlYVFA kWGhdVGRETFhoSFyQUDg9ZV1kYEgtZQVlJSkNVQk9VSkpDVUJLWVdZFhoPEhUdFFlBWU9LSFVKS0 lPT09IVUpLS1VKQktLWQY+ X-Stat-Signature: w9qsi95iotcpf6fx1yetouibimbk13j4 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 722A9C000C X-Rspam-User: X-HE-Tag: 1788769606-795762 X-HE-Meta: U2FsdGVkX18LIL+qGgT8LQVVfwvqFC6Pxskmwn/NDVIIP7bHV5KFw2kK+fXH9bd49fHUNFiiSORvJAJqLl9Ulpd/4Gcyu2Z1IvHBS1DYtIdbYjy6DQqVkSzP0rbIyNE+Ld81NoRKCBBMn2oumcg8sJbZN7pw1Pnc+fp6EHAcOozeDyHbdHZr7tPW/0vMzp8Di0V0ulhkYU0SfskhdtiCO24N2iXyGDmd9DqGQ+6qsAzbR9fG3gOc4iQMbkFkry35iHjFZ7nqzU2P3vsoIJ2JlkBBmC28eG4XhmF8PZBxEQx41pKYYdX++4l6YN1Hj5zg3YjJY0gMz5EsVx5PXg662s1K/mZc5UWoDsaMT1TSimKpqfGlitjpK4A+RqBWzM+hu+0Xmwq7qOIT0jFy6eUfWHGPrHbe2JjQiPGWTrpMHfmNqebypx8ELttuF13O283uAIwLcc5/9FY8ekc5NgBdxywx+E92/3pfXBf2ZVOtGGKLNlBcCk1UbIhv6Xof4C/xxoxG/zQQmdJKRLlGWnt+5Ky5DclaZIKdWlxFJbbst4vcKUHvVW3FBOs9zJsVxfwSnWssHR6sSTNKExdYqzcJgYjCcIaPO3Rc8Ow9hFBupnxxvhPQ4clZmIoHw7bCOkHtT1JmDuKbNyx4W5wrkuJwp+h+TElXgV4MoVxny7FrMBoji7ZtmKLoLWhh2HsbrhAmEwtq9JxtT5pTO4rTbjQa4qAP6CB5l8zKl05NXO1zyDu38rDvUlKMYwyMtFBI7yyV4m3eTwY1fkhSTuguqwO6TsMn5shvn9IWaFj6+S6xqGiFaUe6GBi+daF8cpOyTZF7Pu3NDJQ4peLRenIZGf1lwmvORnETQY5+pSRtJFGit5T9NCW02LvIX8LgK6ZefuUpUwAHEh88cuSylsK2qKJ8d13KBJ+My7hcE5lNyhjO+lpKBrYphi3vTk8F7srFlK8fQMBJsz1m5gybgbqszsC kLJ0Ll6T xFcvrA31Wh2V72xJmiX0H62GxMqu1y0y9UoVqpoca0rAWSjEo7h/DtmSIdIH2cLeTjHyl8ZLYwZu6LW8ztdmi08zXto80LDBJNA9EmxLtQtHv9A1Mz4cLXjlGw/Gmn9xmPtsvszU8qLDDduSPnIHNEnuYSAGBoHTcVl3tnDiuM3sjPFQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Extend filter to support thread group ID (TGID) filtering alongside PID filtering. Reuses existing PID parsing and binary search infrastructure with separate TGID list and count fields. Signed-off-by: Zhen Ni --- Changes in v3: - No change. Changes in v2: - No change. v1: https://lore.kernel.org/linux-mm/20260828031339.1270699-3-zhen.ni@easystack.cn/ v2: https://lore.kernel.org/linux-mm/20260903041819.1776630-3-zhen.ni@easystack.cn/ --- mm/page_owner.c | 43 ++++++++++++++++++++++++++++++++++++------- 1 file changed, 36 insertions(+), 7 deletions(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index 8c704f1916ff..b27a96aba482 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -71,6 +71,7 @@ static const char * const page_owner_print_mode_strings[] = { /* PID_MAX_LIMIT = 4,194,304 (7 decimal digits) */ #define PID_MAX_DIGITS 7 #define MAX_FILTER_PIDS 16 +#define MAX_FILTER_TGIDS 16 struct page_owner_filter_state { enum page_owner_print_mode print_mode; @@ -78,7 +79,9 @@ struct page_owner_filter_state { bool proc_filter_enabled; nodemask_t nid_filter; int pid_count; + int tgid_count; pid_t pid_list[MAX_FILTER_PIDS]; + pid_t tgid_list[MAX_FILTER_TGIDS]; }; static int cmp_pid_t(const void *a, const void *b) @@ -837,11 +840,19 @@ read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos) if (state->proc_filter_enabled) { bool proc_match = false; - proc_match = bsearch(&page_owner->pid, - state->pid_list, - state->pid_count, - sizeof(pid_t), - cmp_pid_t) != NULL; + if (state->pid_count > 0) + proc_match = bsearch(&page_owner->pid, + state->pid_list, + state->pid_count, + sizeof(pid_t), + cmp_pid_t) != NULL; + + if (!proc_match && state->tgid_count > 0) + proc_match = bsearch(&page_owner->tgid, + state->tgid_list, + state->tgid_count, + sizeof(pid_t), + cmp_pid_t) != NULL; if (!proc_match) goto ext_put_continue; @@ -999,7 +1010,9 @@ static ssize_t page_owner_write(struct file *file, nodemask_t new_nid_filter; bool new_nid_filter_enabled; pid_t new_pid_list[MAX_FILTER_PIDS]; + pid_t new_tgid_list[MAX_FILTER_TGIDS]; int new_pid_count = 0; + int new_tgid_count = 0; /* * Maximum input length for filter commands: @@ -1010,7 +1023,8 @@ static ssize_t page_owner_write(struct file *file, * - For list filters: (digit+comma) * count + prefix */ if (count > 32 + 6 * MAX_NUMNODES + - (PID_MAX_DIGITS + 1) * MAX_FILTER_PIDS + 4) + (PID_MAX_DIGITS + 1) * MAX_FILTER_PIDS + 4 + + (PID_MAX_DIGITS + 1) * MAX_FILTER_TGIDS + 5) return -EINVAL; kbuf = memdup_user_nul(buf, count); @@ -1026,6 +1040,10 @@ static ssize_t page_owner_write(struct file *file, memcpy(new_pid_list, state->pid_list, sizeof(state->pid_list)); new_pid_count = state->pid_count; } + if (state->tgid_count > 0) { + memcpy(new_tgid_list, state->tgid_list, sizeof(state->tgid_list)); + new_tgid_count = state->tgid_count; + } while ((token = strsep(&kbuf, " \t\n")) != NULL) { if (*token == '\0') @@ -1061,6 +1079,10 @@ static ssize_t page_owner_write(struct file *file, ret = parse_pid_t_list(token + 4, new_pid_list, &new_pid_count); if (ret < 0) goto out_free; + } else if (!strncmp(token, "tgid=", 5)) { + ret = parse_pid_t_list(token + 5, new_tgid_list, &new_tgid_count); + if (ret < 0) + goto out_free; } else { ret = -EINVAL; goto out_free; @@ -1071,7 +1093,7 @@ static ssize_t page_owner_write(struct file *file, state->print_mode = new_print_mode; state->nid_filter = new_nid_filter; state->nid_filter_enabled = new_nid_filter_enabled; - state->proc_filter_enabled = new_pid_count > 0; + state->proc_filter_enabled = new_pid_count > 0 || new_tgid_count > 0; if (new_pid_count > 0) { memcpy(state->pid_list, new_pid_list, sizeof(state->pid_list)); state->pid_count = new_pid_count; @@ -1079,6 +1101,13 @@ static ssize_t page_owner_write(struct file *file, if (state->pid_count > 1) sort(state->pid_list, state->pid_count, sizeof(pid_t), cmp_pid_t, NULL); + if (new_tgid_count > 0) { + memcpy(state->tgid_list, new_tgid_list, sizeof(state->tgid_list)); + state->tgid_count = new_tgid_count; + } + if (state->tgid_count > 1) + sort(state->tgid_list, state->tgid_count, sizeof(pid_t), + cmp_pid_t, NULL); ret = count; -- 2.20.1