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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 2/8] mm/page_owner: Add TGID filtering support Date: Fri, 28 Aug 2026 11:13:33 +0800 Message-Id: <20260828031339.1270699-3-zhen.ni@easystack.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20260828031339.1270699-1-zhen.ni@easystack.cn> References: <20260828031339.1270699-1-zhen.ni@easystack.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-HM-Tid: 0aa0465c12fe0229kunma81ef96712a32f X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFJQjdXWRgWCB1ZQUpXWS1ZQUlXWQ8JGhUIEh9ZQVlDQ0MdVhofS0NMTRoaTRpDS1YVFA kWGhdVGRETFhoSFyQUDg9ZV1kYEgtZQVlJSkNVQk9VSkpDVUJLWVdZFhoPEhUdFFlBWU9LSFVKS0 lPT09IVUpLS1VKQktLWQY+ X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 3C2DA180006 X-Stat-Signature: bsphtgegdfu1rf4j7g7yhh8z4ygob8jx X-HE-Tag: 1787886838-686297 X-HE-Meta: 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 L1+c+J4S vgOj+sjMY2J6XnpFNCy1B1ePKG/pfw9+S+yGJRNlZ/v2AL1oO/Q72oTyxK1b9D1faIw7268Ctph7TwFzFa1sITAz+HdtNqRyXAsS2Au7gfYBY8iHGXolwFEWCEjudVB3p2CO/cgcFdPwCQpdD6P1Lnh4ufL6KWEI+gIDZWjAvtDbJIx+pyQvrKdC9AvfNGkyvHj7upXrnDZw6MILfhAUbf/R8VLFu0lRt0IrEgYjqWFZtLmQ= 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 --- 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 33b9e12a019b..077867e9e572 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; @@ -1010,7 +1021,9 @@ 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: @@ -1021,7 +1034,8 @@ 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); @@ -1038,6 +1052,10 @@ 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') @@ -1073,6 +1091,10 @@ 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; @@ -1083,7 +1105,7 @@ 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; @@ -1091,6 +1113,13 @@ 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