summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMinchan Kim <minchan@kernel.org>2014-01-30 15:45:52 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-30 16:56:55 -0800
commitcd67e10ac6997c6d1e1504e3c111b693bfdbc148 (patch)
treea37521eff62f7e7e86ab94be44f02aca4c6a0abb
parentbcf1647d0899666f0fb90d176abf63bae22abb7c (diff)
downloadlinux-cd67e10ac6997c6d1e1504e3c111b693bfdbc148.tar.bz2
zram: promote zram from staging
Zram has lived in staging for a LONG LONG time and have been fixed/improved by many contributors so code is clean and stable now. Of course, there are lots of product using zram in real practice. The major TV companys have used zram as swap since two years ago and recently our production team released android smart phone with zram which is used as swap, too and recently Android Kitkat start to use zram for small memory smart phone. And there was a report Google released their ChromeOS with zram, too and cyanogenmod have been used zram long time ago. And I heard some disto have used zram block device for tmpfs. In addition, I saw many report from many other peoples. For example, Lubuntu start to use it. The benefit of zram is very clear. With my experience, one of the benefit was to remove jitter of video application with backgroud memory pressure. It would be effect of efficient memory usage by compression but more issue is whether swap is there or not in the system. Recent mobile platforms have used JAVA so there are many anonymous pages. But embedded system normally are reluctant to use eMMC or SDCard as swap because there is wear-leveling and latency issues so if we do not use swap, it means we can't reclaim anoymous pages and at last, we could encounter OOM kill. :( Although we have real storage as swap, it was a problem, too. Because it sometime ends up making system very unresponsible caused by slow swap storage performance. Quote from Luigi on Google "Since Chrome OS was mentioned: the main reason why we don't use swap to a disk (rotating or SSD) is because it doesn't degrade gracefully and leads to a bad interactive experience. Generally we prefer to manage RAM at a higher level, by transparently killing and restarting processes. But we noticed that zram is fast enough to be competitive with the latter, and it lets us make more efficient use of the available RAM. " and he announced. http://www.spinics.net/lists/linux-mm/msg57717.html Other uses case is to use zram for block device. Zram is block device so anyone can format the block device and mount on it so some guys on the internet start zram as /var/tmp. http://forums.gentoo.org/viewtopic-t-838198-start-0.html Let's promote zram and enhance/maintain it instead of removing. Signed-off-by: Minchan Kim <minchan@kernel.org> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Nitin Gupta <ngupta@vflare.org> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: Bob Liu <bob.liu@oracle.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Hugh Dickins <hughd@google.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Luigi Semenzato <semenzato@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Seth Jennings <sjenning@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/blockdev/zram.txt (renamed from drivers/staging/zram/zram.txt)0
-rw-r--r--drivers/block/Kconfig2
-rw-r--r--drivers/block/Makefile1
-rw-r--r--drivers/block/zram/Kconfig (renamed from drivers/staging/zram/Kconfig)0
-rw-r--r--drivers/block/zram/Makefile (renamed from drivers/staging/zram/Makefile)0
-rw-r--r--drivers/block/zram/zram_drv.c (renamed from drivers/staging/zram/zram_drv.c)0
-rw-r--r--drivers/block/zram/zram_drv.h (renamed from drivers/staging/zram/zram_drv.h)0
-rw-r--r--drivers/staging/Kconfig2
-rw-r--r--drivers/staging/Makefile1
9 files changed, 3 insertions, 3 deletions
diff --git a/drivers/staging/zram/zram.txt b/Documentation/blockdev/zram.txt
index 765d790ae831..765d790ae831 100644
--- a/drivers/staging/zram/zram.txt
+++ b/Documentation/blockdev/zram.txt
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 9ffa90c6201c..014a1cfc41c5 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -108,6 +108,8 @@ source "drivers/block/paride/Kconfig"
source "drivers/block/mtip32xx/Kconfig"
+source "drivers/block/zram/Kconfig"
+
config BLK_CPQ_DA
tristate "Compaq SMART2 support"
depends on PCI && VIRT_TO_BUS && 0
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 816d979c3266..02b688d1438d 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_BLK_DEV_PCIESSD_MTIP32XX) += mtip32xx/
obj-$(CONFIG_BLK_DEV_RSXX) += rsxx/
obj-$(CONFIG_BLK_DEV_NULL_BLK) += null_blk.o
+obj-$(CONFIG_ZRAM) += zram/
nvme-y := nvme-core.o nvme-scsi.o
skd-y := skd_main.o
diff --git a/drivers/staging/zram/Kconfig b/drivers/block/zram/Kconfig
index 983314c41349..983314c41349 100644
--- a/drivers/staging/zram/Kconfig
+++ b/drivers/block/zram/Kconfig
diff --git a/drivers/staging/zram/Makefile b/drivers/block/zram/Makefile
index cb0f9ced6a93..cb0f9ced6a93 100644
--- a/drivers/staging/zram/Makefile
+++ b/drivers/block/zram/Makefile
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 108f2733106d..108f2733106d 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
diff --git a/drivers/staging/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index d8f6596513c3..d8f6596513c3 100644
--- a/drivers/staging/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 120d2fa9e531..040a51525b42 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -76,8 +76,6 @@ source "drivers/staging/sep/Kconfig"
source "drivers/staging/iio/Kconfig"
-source "drivers/staging/zram/Kconfig"
-
source "drivers/staging/wlags49_h2/Kconfig"
source "drivers/staging/wlags49_h25/Kconfig"
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index cb19d0afa0da..dea056bf7ff2 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -32,7 +32,6 @@ obj-$(CONFIG_VT6656) += vt6656/
obj-$(CONFIG_VME_BUS) += vme/
obj-$(CONFIG_DX_SEP) += sep/
obj-$(CONFIG_IIO) += iio/
-obj-$(CONFIG_ZRAM) += zram/
obj-$(CONFIG_WLAGS49_H2) += wlags49_h2/
obj-$(CONFIG_WLAGS49_H25) += wlags49_h25/
obj-$(CONFIG_FB_SM7XX) += sm7xxfb/