Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752757AbaLUQff (ORCPT ); Sun, 21 Dec 2014 11:35:35 -0500 Received: from mail.kernel.org ([198.145.19.201]:52575 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752346AbaLUQfb (ORCPT ); Sun, 21 Dec 2014 11:35:31 -0500 From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim Subject: [PATCH 3/6] f2fs: add key functions for f2fs_io_tracer Date: Sun, 21 Dec 2014 08:35:20 -0800 Message-Id: <1419179723-3234-3-git-send-email-jaegeuk@kernel.org> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1419179723-3234-1-git-send-email-jaegeuk@kernel.org> References: <1419179723-3234-1-git-send-email-jaegeuk@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds two key functions to trace process ids and IOs. The basic idea is to 1. remain process ids, pids, in page->private. 2. show pids in IO traces. So, later we can retrieve process information according to IO traces. Signed-off-by: Jaegeuk Kim --- fs/f2fs/trace.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/f2fs/trace.h | 18 ++++++++++++ 2 files changed, 104 insertions(+) diff --git a/fs/f2fs/trace.c b/fs/f2fs/trace.c index 4e4a069..19f5216 100644 --- a/fs/f2fs/trace.c +++ b/fs/f2fs/trace.c @@ -15,10 +15,96 @@ #include "f2fs.h" #include "trace.h" +RADIX_TREE(pids, GFP_NOIO); +struct last_io_info last_io; + +static inline void __print_last_io(void) +{ + if (!last_io.len) + return; + + trace_printk("%3x:%3x %4x %-16s %2x %5x %12x %4x\n", + last_io.major, last_io.minor, + last_io.pid, "----------------", + last_io.type, + last_io.fio.rw, last_io.fio.blk_addr, + last_io.len); + memset(&last_io, 0, sizeof(last_io)); +} + +static int __file_type(struct inode *inode, pid_t pid) +{ + if (f2fs_is_atomic_file(inode)) + return __ATOMIC_FILE; + else if (f2fs_is_volatile_file(inode)) + return __VOLATILE_FILE; + else if (S_ISDIR(inode->i_mode)) + return __DIR_FILE; + else if (inode->i_ino == F2FS_NODE_INO(F2FS_I_SB(inode))) + return __NODE_FILE; + else if (inode->i_ino == F2FS_META_INO(F2FS_I_SB(inode))) + return __META_FILE; + else if (pid) + return __NORMAL_FILE; + else + return __MISC_FILE; +} + void f2fs_trace_pid(struct page *page) { + struct inode *inode = page->mapping->host; + pid_t pid = task_pid_nr(current); + void *p; + + page->private = pid; + + p = radix_tree_lookup(&pids, pid); + if (p == current) + return; + if (p) + radix_tree_delete(&pids, pid); + + f2fs_radix_tree_insert(&pids, pid, current); + + trace_printk("%3x:%3x %4x %-16s\n", + MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev), + pid, current->comm); + } void f2fs_trace_ios(struct page *page, struct f2fs_io_info *fio, int flush) { + struct inode *inode; + pid_t pid; + int major, minor; + + if (flush) { + __print_last_io(); + return; + } + + inode = page->mapping->host; + pid = page_private(page); + + major = MAJOR(inode->i_sb->s_dev); + minor = MINOR(inode->i_sb->s_dev); + + if (last_io.major == major && last_io.minor == minor && + last_io.pid == pid && + last_io.type == __file_type(inode, pid) && + last_io.fio.rw == fio->rw && + last_io.fio.blk_addr + last_io.len == fio->blk_addr) { + last_io.len++; + return; + } + + __print_last_io(); + + last_io.major = major; + last_io.minor = minor; + last_io.pid = pid; + last_io.type = __file_type(inode, pid); + last_io.fio = *fio; + last_io.len = 1; + return; } diff --git a/fs/f2fs/trace.h b/fs/f2fs/trace.h index 08856a9..aa6663b 100644 --- a/fs/f2fs/trace.h +++ b/fs/f2fs/trace.h @@ -14,6 +14,24 @@ #ifdef CONFIG_F2FS_IO_TRACE #include +enum file_type { + __NORMAL_FILE, + __DIR_FILE, + __NODE_FILE, + __META_FILE, + __ATOMIC_FILE, + __VOLATILE_FILE, + __MISC_FILE, +}; + +struct last_io_info { + int major, minor; + pid_t pid; + enum file_type type; + struct f2fs_io_info fio; + block_t len; +}; + extern void f2fs_trace_pid(struct page *); extern void f2fs_trace_ios(struct page *, struct f2fs_io_info *, int); #else -- 2.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/