From: Vitaly Wool <vitalywool@gmail.com> To: minchan@kernel.org, sergey.senozhatsky@gmail.com, ddstreet@ieee.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/3] zram: make max_zpage_size configurable Date: Mon, 14 Sep 2015 15:50:36 +0200 [thread overview] Message-ID: <20150914155036.7c90a8e313cb0ed4d4857934@gmail.com> (raw) In-Reply-To: <20150914154901.92c5b7b24e15f04d8204de18@gmail.com> It makes sense to have control over what compression ratios are ok to store pages uncompressed and what not. Moreover, if we end up using zbud allocator for zram, any attempt to allocate a whole page will fail, so we may want to avoid this as much as possible. So, let's have max_zpage_size configurable as a module parameter. Signed-off-by: Vitaly Wool <vitalywool@gmail.com> --- drivers/block/zram/zram_drv.c | 13 +++++++++++++ drivers/block/zram/zram_drv.h | 16 ---------------- 2 files changed, 13 insertions(+), 16 deletions(-) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 9fa15bb..6d9f1d1 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -42,6 +42,7 @@ static const char *default_compressor = "lzo"; /* Module params (documentation at end) */ static unsigned int num_devices = 1; +static size_t max_zpage_size = PAGE_SIZE / 4 * 3; static inline void deprecated_attr_warn(const char *name) { @@ -1411,6 +1412,16 @@ static int __init zram_init(void) return ret; } + /* + * max_zpage_size must be less than or equal to: + * ZS_MAX_ALLOC_SIZE. Otherwise, zs_malloc() would + * always return failure. + */ + if (max_zpage_size > PAGE_SIZE) { + pr_err("Invalid max_zpage_size %ld\n", max_zpage_size); + return -EINVAL; + } + zram_major = register_blkdev(0, "zram"); if (zram_major <= 0) { pr_err("Unable to get major number\n"); @@ -1444,6 +1455,8 @@ module_exit(zram_exit); module_param(num_devices, uint, 0); MODULE_PARM_DESC(num_devices, "Number of pre-created zram devices"); +module_param(max_zpage_size, ulong, 0); +MODULE_PARM_DESC(max_zpage_size, "Threshold for storing compressed pages"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Nitin Gupta <ngupta@vflare.org>"); diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index 8e92339..3a29c33 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -20,22 +20,6 @@ #include "zcomp.h" -/*-- Configurable parameters */ - -/* - * Pages that compress to size greater than this are stored - * uncompressed in memory. - */ -static const size_t max_zpage_size = PAGE_SIZE / 4 * 3; - -/* - * NOTE: max_zpage_size must be less than or equal to: - * ZS_MAX_ALLOC_SIZE. Otherwise, zs_malloc() would - * always return failure. - */ - -/*-- End of configurable params */ - #define SECTOR_SHIFT 9 #define SECTORS_PER_PAGE_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) #define SECTORS_PER_PAGE (1 << SECTORS_PER_PAGE_SHIFT) -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Vitaly Wool <vitalywool@gmail.com> To: minchan@kernel.org, sergey.senozhatsky@gmail.com, ddstreet@ieee.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/3] zram: make max_zpage_size configurable Date: Mon, 14 Sep 2015 15:50:36 +0200 [thread overview] Message-ID: <20150914155036.7c90a8e313cb0ed4d4857934@gmail.com> (raw) In-Reply-To: <20150914154901.92c5b7b24e15f04d8204de18@gmail.com> It makes sense to have control over what compression ratios are ok to store pages uncompressed and what not. Moreover, if we end up using zbud allocator for zram, any attempt to allocate a whole page will fail, so we may want to avoid this as much as possible. So, let's have max_zpage_size configurable as a module parameter. Signed-off-by: Vitaly Wool <vitalywool@gmail.com> --- drivers/block/zram/zram_drv.c | 13 +++++++++++++ drivers/block/zram/zram_drv.h | 16 ---------------- 2 files changed, 13 insertions(+), 16 deletions(-) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 9fa15bb..6d9f1d1 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -42,6 +42,7 @@ static const char *default_compressor = "lzo"; /* Module params (documentation at end) */ static unsigned int num_devices = 1; +static size_t max_zpage_size = PAGE_SIZE / 4 * 3; static inline void deprecated_attr_warn(const char *name) { @@ -1411,6 +1412,16 @@ static int __init zram_init(void) return ret; } + /* + * max_zpage_size must be less than or equal to: + * ZS_MAX_ALLOC_SIZE. Otherwise, zs_malloc() would + * always return failure. + */ + if (max_zpage_size > PAGE_SIZE) { + pr_err("Invalid max_zpage_size %ld\n", max_zpage_size); + return -EINVAL; + } + zram_major = register_blkdev(0, "zram"); if (zram_major <= 0) { pr_err("Unable to get major number\n"); @@ -1444,6 +1455,8 @@ module_exit(zram_exit); module_param(num_devices, uint, 0); MODULE_PARM_DESC(num_devices, "Number of pre-created zram devices"); +module_param(max_zpage_size, ulong, 0); +MODULE_PARM_DESC(max_zpage_size, "Threshold for storing compressed pages"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Nitin Gupta <ngupta@vflare.org>"); diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index 8e92339..3a29c33 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -20,22 +20,6 @@ #include "zcomp.h" -/*-- Configurable parameters */ - -/* - * Pages that compress to size greater than this are stored - * uncompressed in memory. - */ -static const size_t max_zpage_size = PAGE_SIZE / 4 * 3; - -/* - * NOTE: max_zpage_size must be less than or equal to: - * ZS_MAX_ALLOC_SIZE. Otherwise, zs_malloc() would - * always return failure. - */ - -/*-- End of configurable params */ - #define SECTOR_SHIFT 9 #define SECTORS_PER_PAGE_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) #define SECTORS_PER_PAGE (1 << SECTORS_PER_PAGE_SHIFT) -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-09-14 13:50 UTC|newest] Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-09-14 13:49 [PATCH 0/3] allow zram to use zbud as underlying allocator Vitaly Wool 2015-09-14 13:49 ` Vitaly Wool 2015-09-14 13:50 ` Vitaly Wool [this message] 2015-09-14 13:50 ` [PATCH 1/3] zram: make max_zpage_size configurable Vitaly Wool 2015-09-15 1:00 ` Sergey Senozhatsky 2015-09-15 1:00 ` Sergey Senozhatsky 2015-09-15 7:18 ` Vitaly Wool 2015-09-15 7:38 ` Sergey Senozhatsky 2015-09-15 7:38 ` Sergey Senozhatsky 2015-09-15 5:42 ` Dan Streetman 2015-09-15 5:42 ` Dan Streetman 2015-09-15 6:08 ` Sergey Senozhatsky 2015-09-15 6:08 ` Sergey Senozhatsky 2015-09-14 13:51 ` [PATCH 2/3] zpool/zsmalloc/zbud: align on interfaces Vitaly Wool 2015-09-14 13:51 ` Vitaly Wool 2015-09-15 1:06 ` Sergey Senozhatsky 2015-09-15 1:06 ` Sergey Senozhatsky 2015-09-15 5:09 ` Dan Streetman 2015-09-15 5:09 ` Dan Streetman 2015-09-14 13:55 ` [PATCH 3/3] zram: use common zpool interface Vitaly Wool 2015-09-14 13:55 ` Vitaly Wool 2015-09-15 1:12 ` Sergey Senozhatsky 2015-09-15 1:12 ` Sergey Senozhatsky 2015-09-15 6:03 ` Dan Streetman 2015-09-15 6:03 ` Dan Streetman 2015-09-14 14:01 ` [PATCH 0/3] allow zram to use zbud as underlying allocator Vlastimil Babka 2015-09-14 14:01 ` Vlastimil Babka 2015-09-14 14:12 ` Vitaly Wool 2015-09-14 14:12 ` Vitaly Wool 2015-09-14 14:14 ` Vlastimil Babka 2015-09-14 14:14 ` Vlastimil Babka 2015-09-15 4:08 ` Dan Streetman 2015-09-15 4:08 ` Dan Streetman 2015-09-15 4:22 ` Sergey Senozhatsky 2015-09-15 4:22 ` Sergey Senozhatsky 2015-09-17 6:21 ` Vlastimil Babka 2015-09-17 6:21 ` Vlastimil Babka 2015-09-17 9:19 ` Sergey Senozhatsky 2015-09-17 9:19 ` Sergey Senozhatsky 2015-09-15 0:49 ` Sergey Senozhatsky 2015-09-15 0:49 ` Sergey Senozhatsky 2015-09-15 6:13 ` Minchan Kim 2015-09-15 6:13 ` Minchan Kim 2015-09-25 9:54 ` Vitaly Wool 2015-09-25 9:54 ` Vitaly Wool 2015-09-30 7:52 ` Minchan Kim 2015-09-30 7:52 ` Minchan Kim 2015-09-30 8:01 ` Vitaly Wool 2015-09-30 8:01 ` Vitaly Wool 2015-09-30 8:13 ` Minchan Kim 2015-09-30 8:13 ` Minchan Kim 2015-09-30 8:18 ` Vitaly Wool 2015-09-30 8:18 ` Vitaly Wool 2015-09-30 15:37 ` Vlastimil Babka 2015-09-30 15:37 ` Vlastimil Babka 2015-09-30 15:46 ` Vitaly Wool 2015-09-30 15:46 ` Vitaly Wool 2015-10-01 7:52 ` Vlastimil Babka 2015-10-01 7:52 ` Vlastimil Babka 2015-10-10 9:33 ` Vitaly Wool 2015-10-10 9:33 ` Vitaly Wool 2015-10-14 13:28 ` Vlastimil Babka 2015-10-14 13:28 ` Vlastimil Babka
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