* [PATCH v2 1/2] zram: pass gfp from zcomp frontend to backend
2015-12-01 12:38 [PATCH v2 0/2] zram: cleanup stream's ->private allocation code Sergey Senozhatsky
@ 2015-12-01 12:38 ` Sergey Senozhatsky
2015-12-01 12:38 ` [PATCH v2 2/2] zram/zcomp: do not zero out zcomp private pages Sergey Senozhatsky
1 sibling, 0 replies; 3+ messages in thread
From: Sergey Senozhatsky @ 2015-12-01 12:38 UTC (permalink / raw)
To: Andrew Morton
Cc: Minchan Kim, linux-kernel, Sergey Senozhatsky, Sergey Senozhatsky
From: Minchan Kim <minchan@kernel.org>
Each zcomp backend uses own gfp flag but it's pointless because the
context they could be called is driven by upper layer(ie, zcomp frontend).
As well, zcomp frondend could call them in different context. One
context(ie, zram init part) is it should be better to make sure successful
allocation other context(ie, further stream allocation part for
accelarating I/O speed) is just optional so let's pass gfp down from
driver (ie, zcomp frontend) like normal MM convention.
[sergey.senozhatsky@gmail.com: add missing __vmalloc zero and highmem gfps]
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
---
drivers/block/zram/zcomp.c | 24 ++++++++++++++++--------
drivers/block/zram/zcomp.h | 2 +-
drivers/block/zram/zcomp_lz4.c | 16 +++-------------
drivers/block/zram/zcomp_lzo.c | 16 +++-------------
4 files changed, 23 insertions(+), 35 deletions(-)
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index c536177..3ef42e5 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -74,18 +74,18 @@ static void zcomp_strm_free(struct zcomp *comp, struct zcomp_strm *zstrm)
* allocate new zcomp_strm structure with ->private initialized by
* backend, return NULL on error
*/
-static struct zcomp_strm *zcomp_strm_alloc(struct zcomp *comp)
+static struct zcomp_strm *zcomp_strm_alloc(struct zcomp *comp, gfp_t flags)
{
- struct zcomp_strm *zstrm = kmalloc(sizeof(*zstrm), GFP_NOIO);
+ struct zcomp_strm *zstrm = kmalloc(sizeof(*zstrm), flags);
if (!zstrm)
return NULL;
- zstrm->private = comp->backend->create();
+ zstrm->private = comp->backend->create(flags);
/*
* allocate 2 pages. 1 for compressed data, plus 1 extra for the
* case when compressed size is larger than the original one
*/
- zstrm->buffer = (void *)__get_free_pages(GFP_NOIO | __GFP_ZERO, 1);
+ zstrm->buffer = (void *)__get_free_pages(flags | __GFP_ZERO, 1);
if (!zstrm->private || !zstrm->buffer) {
zcomp_strm_free(comp, zstrm);
zstrm = NULL;
@@ -120,8 +120,16 @@ static struct zcomp_strm *zcomp_strm_multi_find(struct zcomp *comp)
/* allocate new zstrm stream */
zs->avail_strm++;
spin_unlock(&zs->strm_lock);
-
- zstrm = zcomp_strm_alloc(comp);
+ /*
+ * This function can be called in swapout/fs write path
+ * so we can't use GFP_FS|IO. And it assumes we already
+ * have at least one stream in zram initialization so we
+ * don't do best effort to allocate more stream in here.
+ * A default stream will work well without further multiple
+ * streams. That's why we use NORETRY | NOWARN.
+ */
+ zstrm = zcomp_strm_alloc(comp, GFP_NOIO | __GFP_NORETRY |
+ __GFP_NOWARN);
if (!zstrm) {
spin_lock(&zs->strm_lock);
zs->avail_strm--;
@@ -209,7 +217,7 @@ static int zcomp_strm_multi_create(struct zcomp *comp, int max_strm)
zs->max_strm = max_strm;
zs->avail_strm = 1;
- zstrm = zcomp_strm_alloc(comp);
+ zstrm = zcomp_strm_alloc(comp, GFP_KERNEL);
if (!zstrm) {
kfree(zs);
return -ENOMEM;
@@ -259,7 +267,7 @@ static int zcomp_strm_single_create(struct zcomp *comp)
comp->stream = zs;
mutex_init(&zs->strm_lock);
- zs->zstrm = zcomp_strm_alloc(comp);
+ zs->zstrm = zcomp_strm_alloc(comp, GFP_KERNEL);
if (!zs->zstrm) {
kfree(zs);
return -ENOMEM;
diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
index 46e2b9f..b7d2a4b 100644
--- a/drivers/block/zram/zcomp.h
+++ b/drivers/block/zram/zcomp.h
@@ -33,7 +33,7 @@ struct zcomp_backend {
int (*decompress)(const unsigned char *src, size_t src_len,
unsigned char *dst);
- void *(*create)(void);
+ void *(*create)(gfp_t flags);
void (*destroy)(void *private);
const char *name;
diff --git a/drivers/block/zram/zcomp_lz4.c b/drivers/block/zram/zcomp_lz4.c
index dd60831..dc2338d 100644
--- a/drivers/block/zram/zcomp_lz4.c
+++ b/drivers/block/zram/zcomp_lz4.c
@@ -15,24 +15,14 @@
#include "zcomp_lz4.h"
-static void *zcomp_lz4_create(void)
+static void *zcomp_lz4_create(gfp_t flags)
{
void *ret;
- /*
- * This function can be called in swapout/fs write path
- * so we can't use GFP_FS|IO. And it assumes we already
- * have at least one stream in zram initialization so we
- * don't do best effort to allocate more stream in here.
- * A default stream will work well without further multiple
- * streams. That's why we use NORETRY | NOWARN.
- */
- ret = kzalloc(LZ4_MEM_COMPRESS, GFP_NOIO | __GFP_NORETRY |
- __GFP_NOWARN);
+ ret = kzalloc(LZ4_MEM_COMPRESS, flags);
if (!ret)
ret = __vmalloc(LZ4_MEM_COMPRESS,
- GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN |
- __GFP_ZERO | __GFP_HIGHMEM,
+ flags | __GFP_ZERO | __GFP_HIGHMEM,
PAGE_KERNEL);
return ret;
}
diff --git a/drivers/block/zram/zcomp_lzo.c b/drivers/block/zram/zcomp_lzo.c
index edc5499..0ab6fce 100644
--- a/drivers/block/zram/zcomp_lzo.c
+++ b/drivers/block/zram/zcomp_lzo.c
@@ -15,24 +15,14 @@
#include "zcomp_lzo.h"
-static void *lzo_create(void)
+static void *lzo_create(gfp_t flags)
{
void *ret;
- /*
- * This function can be called in swapout/fs write path
- * so we can't use GFP_FS|IO. And it assumes we already
- * have at least one stream in zram initialization so we
- * don't do best effort to allocate more stream in here.
- * A default stream will work well without further multiple
- * streams. That's why we use NORETRY | NOWARN.
- */
- ret = kzalloc(LZO1X_MEM_COMPRESS, GFP_NOIO | __GFP_NORETRY |
- __GFP_NOWARN);
+ ret = kzalloc(LZO1X_MEM_COMPRESS, flags);
if (!ret)
ret = __vmalloc(LZO1X_MEM_COMPRESS,
- GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN |
- __GFP_ZERO | __GFP_HIGHMEM,
+ flags | __GFP_ZERO | __GFP_HIGHMEM,
PAGE_KERNEL);
return ret;
}
--
2.6.2
^ permalink raw reply [flat|nested] 3+ messages in thread* [PATCH v2 2/2] zram/zcomp: do not zero out zcomp private pages
2015-12-01 12:38 [PATCH v2 0/2] zram: cleanup stream's ->private allocation code Sergey Senozhatsky
2015-12-01 12:38 ` [PATCH v2 1/2] zram: pass gfp from zcomp frontend to backend Sergey Senozhatsky
@ 2015-12-01 12:38 ` Sergey Senozhatsky
1 sibling, 0 replies; 3+ messages in thread
From: Sergey Senozhatsky @ 2015-12-01 12:38 UTC (permalink / raw)
To: Andrew Morton
Cc: Minchan Kim, linux-kernel, Sergey Senozhatsky, Sergey Senozhatsky
Do not __GFP_ZERO allocated zcomp ->private pages. We keep allocated
streams around and use them for read/write requests, so we supply a zeroed
out ->private to compression algorithm as a scratch buffer only once --
the first time we use that stream. For the rest of IO requests served by
this stream ->private usually contains some temporarily data from the
previous requests.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
---
drivers/block/zram/zcomp_lz4.c | 4 ++--
drivers/block/zram/zcomp_lzo.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/block/zram/zcomp_lz4.c b/drivers/block/zram/zcomp_lz4.c
index dc2338d..0110086 100644
--- a/drivers/block/zram/zcomp_lz4.c
+++ b/drivers/block/zram/zcomp_lz4.c
@@ -19,10 +19,10 @@ static void *zcomp_lz4_create(gfp_t flags)
{
void *ret;
- ret = kzalloc(LZ4_MEM_COMPRESS, flags);
+ ret = kmalloc(LZ4_MEM_COMPRESS, flags);
if (!ret)
ret = __vmalloc(LZ4_MEM_COMPRESS,
- flags | __GFP_ZERO | __GFP_HIGHMEM,
+ flags | __GFP_HIGHMEM,
PAGE_KERNEL);
return ret;
}
diff --git a/drivers/block/zram/zcomp_lzo.c b/drivers/block/zram/zcomp_lzo.c
index 0ab6fce..ed7a1f0 100644
--- a/drivers/block/zram/zcomp_lzo.c
+++ b/drivers/block/zram/zcomp_lzo.c
@@ -19,10 +19,10 @@ static void *lzo_create(gfp_t flags)
{
void *ret;
- ret = kzalloc(LZO1X_MEM_COMPRESS, flags);
+ ret = kmalloc(LZO1X_MEM_COMPRESS, flags);
if (!ret)
ret = __vmalloc(LZO1X_MEM_COMPRESS,
- flags | __GFP_ZERO | __GFP_HIGHMEM,
+ flags | __GFP_HIGHMEM,
PAGE_KERNEL);
return ret;
}
--
2.6.2
^ permalink raw reply [flat|nested] 3+ messages in thread