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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 v2 2/8] mm/page_owner: Add TGID filtering support Date: Thu, 3 Sep 2026 12:18:13 +0800 Message-Id: <20260903041819.1776630-3-zhen.ni@easystack.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20260903041819.1776630-1-zhen.ni@easystack.cn> References: <20260903041819.1776630-1-zhen.ni@easystack.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-HM-Tid: 0aa0657d69820229kunm7336907a330a6 X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFJQjdXWRgWCB1ZQUpXWS1ZQUlXWQ8JGhUIEh9ZQVkaSE0ZVkoaSUpNSUtOGkNOGVYVFA kWGhdVGRETFhoSFyQUDg9ZV1kYEgtZQVlJSkNVQk9VSkpDVUJLWVdZFhoPEhUdFFlBWU9LSFVKS0 lPT09IVUpLS1VKQktLWQY+ X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: E77851A0006 X-Stat-Signature: 4yub51ma13jnhrmjrkoiibe3iegktmgz X-Rspam-User: X-HE-Tag: 1788409117-982017 X-HE-Meta: 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 U6kwv0la HXdCjOoIrLblmIEsw+Xsybcjz3I2331y4+mZVoXd9N424ZO8CfYqA89BAoNuduuZHTqAOm6hgmyVy9+r4PMyfQ2s2RpiqtiQC7jy6n0eucJ/tTN+ZW2+eZBP/9k8GF9zM+Q3HxQpbc6Wrm6gFdKzMbyj1wwcfDonWW8Ts1/p9fKmQtvmFJM6V4SzFpYPvpvPakkAPdoHOO4pskdlipy0iR9tQ+BW0sFeNIbnPET/YAW2ScInutvIXPR9LcaylHgwsNVk8hYf5fBHPKks= 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 v2: - No change. v1: https://lore.kernel.org/linux-mm/20260828031339.1270699-3-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 0ef081e443f9..e046e61eb98a 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; @@ -1000,7 +1011,9 @@ static ssize_t page_owner_write(struct file *file, bool new_nid_filter_enabled; bool new_proc_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: @@ -1011,7 +1024,8 @@ 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); @@ -1028,6 +1042,10 @@ 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') @@ -1063,6 +1081,10 @@ 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; @@ -1073,7 +1095,7 @@ 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; @@ -1081,6 +1103,13 @@ 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