From e1bc89bc9991e994f2b3c60d9ad2fdb5ad9b10fc Mon Sep 17 00:00:00 2001 From: Peter Osterlund Date: Sat, 4 Feb 2006 23:27:47 -0800 Subject: [PATCH] pktcdvd: Don't waste kernel memory Allocate memory for read-gathering at open time, when it is known just how much memory is needed. This avoids wasting kernel memory when the real packet size is smaller than the maximum packet size supported by the driver. This is always the case when using DVD discs. Signed-off-by: Peter Osterlund Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/block/Kconfig | 4 ++-- drivers/block/pktcdvd.c | 53 ++++++++++++++++++++++++++----------------------- 2 files changed, 30 insertions(+), 27 deletions(-) (limited to 'drivers') diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig index db6818fdf15d..8b1331677407 100644 --- a/drivers/block/Kconfig +++ b/drivers/block/Kconfig @@ -433,8 +433,8 @@ config CDROM_PKTCDVD_BUFFERS This controls the maximum number of active concurrent packets. More concurrent packets can increase write performance, but also require more memory. Each concurrent packet will require approximately 64Kb - of non-swappable kernel memory, memory which will be allocated at - pktsetup time. + of non-swappable kernel memory, memory which will be allocated when + a disc is opened for writing. config CDROM_PKTCDVD_WCACHE bool "Enable write caching (EXPERIMENTAL)" diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index cd16813effc5..4e7dbcc425ff 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -129,7 +129,7 @@ static struct bio *pkt_bio_alloc(int nr_iovecs) /* * Allocate a packet_data struct */ -static struct packet_data *pkt_alloc_packet_data(void) +static struct packet_data *pkt_alloc_packet_data(int frames) { int i; struct packet_data *pkt; @@ -138,11 +138,12 @@ static struct packet_data *pkt_alloc_packet_data(void) if (!pkt) goto no_pkt; - pkt->w_bio = pkt_bio_alloc(PACKET_MAX_SIZE); + pkt->frames = frames; + pkt->w_bio = pkt_bio_alloc(frames); if (!pkt->w_bio) goto no_bio; - for (i = 0; i < PAGES_PER_PACKET; i++) { + for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); if (!pkt->pages[i]) goto no_page; @@ -150,7 +151,7 @@ static struct packet_data *pkt_alloc_packet_data(void) spin_lock_init(&pkt->lock); - for (i = 0; i < PACKET_MAX_SIZE; i++) { + for (i = 0; i < frames; i++) { struct bio *bio = pkt_bio_alloc(1); if (!bio) goto no_rd_bio; @@ -160,14 +161,14 @@ static struct packet_data *pkt_alloc_packet_data(void) return pkt; no_rd_bio: - for (i = 0; i < PACKET_MAX_SIZE; i++) { + for (i = 0; i < frames; i++) { struct bio *bio = pkt->r_bios[i]; if (bio) bio_put(bio); } no_page: - for (i = 0; i < PAGES_PER_PACKET; i++) + for (i = 0; i < frames / FRAMES_PER_PAGE; i++) if (pkt->pages[i]) __free_page(pkt->pages[i]); bio_put(pkt->w_bio); @@ -184,12 +185,12 @@ static void pkt_free_packet_data(struct packet_data *pkt) { int i; - for (i = 0; i < PACKET_MAX_SIZE; i++) { + for (i = 0; i < pkt->frames; i++) { struct bio *bio = pkt->r_bios[i]; if (bio) bio_put(bio); } - for (i = 0; i < PAGES_PER_PACKET; i++) + for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) __free_page(pkt->pages[i]); bio_put(pkt->w_bio); kfree(pkt); @@ -204,17 +205,17 @@ static void pkt_shrink_pktlist(struct pktcdvd_device *pd) list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { pkt_free_packet_data(pkt); } + INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); } static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) { struct packet_data *pkt; - INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); - INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); - spin_lock_init(&pd->cdrw.active_list_lock); + BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); + while (nr_packets > 0) { - pkt = pkt_alloc_packet_data(); + pkt = pkt_alloc_packet_data(pd->settings.size >> 2); if (!pkt) { pkt_shrink_pktlist(pd); return 0; @@ -949,7 +950,7 @@ try_next_bio: pd->current_sector = zone + pd->settings.size; pkt->sector = zone; - pkt->frames = pd->settings.size >> 2; + BUG_ON(pkt->frames != pd->settings.size >> 2); pkt->write_size = 0; /* @@ -1985,8 +1986,14 @@ static int pkt_open_dev(struct pktcdvd_device *pd, int write) if ((ret = pkt_set_segment_merging(pd, q))) goto out_unclaim; - if (write) + if (write) { + if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { + printk("pktcdvd: not enough memory for buffers\n"); + ret = -ENOMEM; + goto out_unclaim; + } printk("pktcdvd: %lukB available on disc\n", lba << 1); + } return 0; @@ -2012,6 +2019,8 @@ static void pkt_release_dev(struct pktcdvd_device *pd, int flush) pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); bd_release(pd->bdev); blkdev_put(pd->bdev); + + pkt_shrink_pktlist(pd); } static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor) @@ -2377,12 +2386,6 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) /* This is safe, since we have a reference from open(). */ __module_get(THIS_MODULE); - if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { - printk("pktcdvd: not enough memory for buffers\n"); - ret = -ENOMEM; - goto out_mem; - } - pd->bdev = bdev; set_blocksize(bdev, CD_FRAMESIZE); @@ -2393,7 +2396,7 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) if (IS_ERR(pd->cdrw.thread)) { printk("pktcdvd: can't start kernel thread\n"); ret = -ENOMEM; - goto out_thread; + goto out_mem; } proc = create_proc_entry(pd->name, 0, pkt_proc); @@ -2404,8 +2407,6 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) DPRINTK("pktcdvd: writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); return 0; -out_thread: - pkt_shrink_pktlist(pd); out_mem: blkdev_put(bdev); /* This is safe: open() is still holding a reference. */ @@ -2501,6 +2502,10 @@ static int pkt_setup_dev(struct pkt_ctrl_command *ctrl_cmd) goto out_mem; pd->disk = disk; + INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); + INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); + spin_lock_init(&pd->cdrw.active_list_lock); + spin_lock_init(&pd->lock); spin_lock_init(&pd->iosched.lock); sprintf(pd->name, "pktcdvd%d", idx); @@ -2565,8 +2570,6 @@ static int pkt_remove_dev(struct pkt_ctrl_command *ctrl_cmd) blkdev_put(pd->bdev); - pkt_shrink_pktlist(pd); - remove_proc_entry(pd->name, pkt_proc); DPRINTK("pktcdvd: writer %s unmapped\n", pd->name); -- cgit v1.2.2