From 5640f7685831e088fe6c2e1f863a6805962f8e81 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sun, 23 Sep 2012 23:04:42 +0000 Subject: net: use a per task frag allocator We currently use a per socket order-0 page cache for tcp_sendmsg() operations. This page is used to build fragments for skbs. Its done to increase probability of coalescing small write() into single segments in skbs still in write queue (not yet sent) But it wastes a lot of memory for applications handling many mostly idle sockets, since each socket holds one page in sk->sk_sndmsg_page Its also quite inefficient to build TSO 64KB packets, because we need about 16 pages per skb on arches where PAGE_SIZE = 4096, so we hit page allocator more than wanted. This patch adds a per task frag allocator and uses bigger pages, if available. An automatic fallback is done in case of memory pressure. (up to 32768 bytes per frag, thats order-3 pages on x86) This increases TCP stream performance by 20% on loopback device, but also benefits on other network devices, since 8x less frags are mapped on transmit and unmapped on tx completion. Alexander Duyck mentioned a probable performance win on systems with IOMMU enabled. Its possible some SG enabled hardware cant cope with bigger fragments, but their ndo_start_xmit() should already handle this, splitting a fragment in sub fragments, since some arches have PAGE_SIZE=65536 Successfully tested on various ethernet devices. (ixgbe, igb, bnx2x, tg3, mellanox mlx4) Signed-off-by: Eric Dumazet Cc: Ben Hutchings Cc: Vijay Subramanian Cc: Alexander Duyck Tested-by: Vijay Subramanian Signed-off-by: David S. Miller --- kernel/exit.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'kernel/exit.c') diff --git a/kernel/exit.c b/kernel/exit.c index f65345f9e5bb..42f25952edd9 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -1046,6 +1046,9 @@ void do_exit(long code) if (tsk->splice_pipe) __free_pipe_info(tsk->splice_pipe); + if (tsk->task_frag.page) + put_page(tsk->task_frag.page); + validate_creds_for_do_exit(tsk); preempt_disable(); -- cgit v1.2.3 From 7cf4dc3c8dbfdfde163d4636f621cf99a1f63bfb Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 15 Aug 2012 19:56:12 -0400 Subject: move files_struct-related bits from kernel/exit.c to fs/file.c Signed-off-by: Al Viro --- kernel/exit.c | 93 ----------------------------------------------------------- 1 file changed, 93 deletions(-) (limited to 'kernel/exit.c') diff --git a/kernel/exit.c b/kernel/exit.c index f65345f9e5bb..20dfc7617c2e 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -466,99 +466,6 @@ void daemonize(const char *name, ...) EXPORT_SYMBOL(daemonize); -static void close_files(struct files_struct * files) -{ - int i, j; - struct fdtable *fdt; - - j = 0; - - /* - * It is safe to dereference the fd table without RCU or - * ->file_lock because this is the last reference to the - * files structure. But use RCU to shut RCU-lockdep up. - */ - rcu_read_lock(); - fdt = files_fdtable(files); - rcu_read_unlock(); - for (;;) { - unsigned long set; - i = j * BITS_PER_LONG; - if (i >= fdt->max_fds) - break; - set = fdt->open_fds[j++]; - while (set) { - if (set & 1) { - struct file * file = xchg(&fdt->fd[i], NULL); - if (file) { - filp_close(file, files); - cond_resched(); - } - } - i++; - set >>= 1; - } - } -} - -struct files_struct *get_files_struct(struct task_struct *task) -{ - struct files_struct *files; - - task_lock(task); - files = task->files; - if (files) - atomic_inc(&files->count); - task_unlock(task); - - return files; -} - -void put_files_struct(struct files_struct *files) -{ - struct fdtable *fdt; - - if (atomic_dec_and_test(&files->count)) { - close_files(files); - /* - * Free the fd and fdset arrays if we expanded them. - * If the fdtable was embedded, pass files for freeing - * at the end of the RCU grace period. Otherwise, - * you can free files immediately. - */ - rcu_read_lock(); - fdt = files_fdtable(files); - if (fdt != &files->fdtab) - kmem_cache_free(files_cachep, files); - free_fdtable(fdt); - rcu_read_unlock(); - } -} - -void reset_files_struct(struct files_struct *files) -{ - struct task_struct *tsk = current; - struct files_struct *old; - - old = tsk->files; - task_lock(tsk); - tsk->files = files; - task_unlock(tsk); - put_files_struct(old); -} - -void exit_files(struct task_struct *tsk) -{ - struct files_struct * files = tsk->files; - - if (files) { - task_lock(tsk); - tsk->files = NULL; - task_unlock(tsk); - put_files_struct(files); - } -} - #ifdef CONFIG_MM_OWNER /* * A task is exiting. If it owned this mm, find a new owner for the mm. -- cgit v1.2.3 From 864bdb3b6cbd9911222543fef1cfe36f88183f44 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 22 Aug 2012 18:42:10 -0400 Subject: new helper: daemonize_descriptors() descriptor-related parts of daemonize, done right. As the result we simplify the locking rules for ->files - we hold task_lock in *all* cases when we modify ->files. Signed-off-by: Al Viro --- kernel/exit.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'kernel/exit.c') diff --git a/kernel/exit.c b/kernel/exit.c index 20dfc7617c2e..095113321318 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -457,9 +457,7 @@ void daemonize(const char *name, ...) /* Become as one with the init task */ daemonize_fs_struct(); - exit_files(current); - current->files = init_task.files; - atomic_inc(¤t->files->count); + daemonize_descriptors(); reparent_to_kthreadd(); } -- cgit v1.2.3