From: Jens Axboe <axboe@suse.de>
Date: Wed, 26 Oct 2005 14:47:33 +0000 (+0200)
Subject: [PATCH] fio: use one big allocation for io units
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=6b71c82639a04e88a6cb8e12cc00c5f08ab3a304;p=disktools.git

[PATCH] fio: use one big allocation for io units
---

diff --git a/fio.c b/fio.c
index e7bdaea..345bd33 100644
--- a/fio.c
+++ b/fio.c
@@ -166,7 +166,6 @@ struct io_u {
 	struct timeval start_time;
 	struct timeval issue_time;
 
-	void *mem;
 	char *buf;
 	unsigned int buflen;
 	unsigned long long offset;
@@ -202,6 +201,7 @@ struct thread_data {
 	int error;
 	int fd;
 	pid_t pid;
+	char *orig_buffer;
 	volatile int terminate;
 	volatile int runstate;
 	unsigned int ddir;
@@ -790,31 +790,36 @@ static void cleanup_io_u(struct thread_data *td)
 		io_u = list_entry(entry, struct io_u, list);
 
 		list_del(&io_u->list);
-		free(io_u->mem);
 		free(io_u);
 	}
+
+	free(td->orig_buffer);
 }
 
 static void init_io_u(struct thread_data *td)
 {
 	struct io_u *io_u;
 	int i, max_units;
+	char *p;
 
 	if (!td->use_aio)
 		max_units = 1;
 	else
 		max_units = td->aio_depth;
 
+	p = malloc(td->bs * max_units + MASK);
+	td->orig_buffer = ALIGN(p);
+
 	INIT_LIST_HEAD(&td->io_u_freelist);
 	INIT_LIST_HEAD(&td->io_u_busylist);
 
+	p = td->orig_buffer;
 	for (i = 0; i < max_units; i++) {
 		io_u = malloc(sizeof(*io_u));
 		memset(io_u, 0, sizeof(*io_u));
 		INIT_LIST_HEAD(&io_u->list);
 
-		io_u->mem = malloc(td->bs + MASK);
-		io_u->buf = ALIGN(io_u->mem);
+		io_u->buf = p + td->bs * i;
 		io_u->buflen = td->bs;
 
 		list_add(&io_u->list, &td->io_u_freelist);