The quilt patch titled
Subject: zram: add recompression algorithm sysfs knob
has been removed from the -mm tree. Its filename was
zram-add-recompression-algorithm-sysfs-knob.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Subject: zram: add recompression algorithm sysfs knob
Date: Tue, 18 Oct 2022 13:55:26 +0900
Introduce recomp_algorithm sysfs knob that controls secondary algorithm
selection used for recompression. This device attribute works in a
similar way with comp_algorithm attribute.
Link: https://lkml.kernel.org/r/20221018045533.2396670-3-senozhatsky@xxxxxxxxxxxx
Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 111 +++++++++++++++++++++++++-------
1 file changed, 90 insertions(+), 21 deletions(-)
--- a/drivers/block/zram/zram_drv.c~zram-add-recompression-algorithm-sysfs-knob
+++ a/drivers/block/zram/zram_drv.c
@@ -41,7 +41,12 @@ static DEFINE_IDR(zram_index_idr);
static DEFINE_MUTEX(zram_index_mutex);
static int zram_major;
-static const char *default_compressor = CONFIG_ZRAM_DEF_COMP;
+static const char *default_comp_algs[ZRAM_MAX_ZCOMPS] = {
+ CONFIG_ZRAM_DEF_COMP,
+#ifdef CONFIG_ZRAM_MULTI_COMP
+ "zstd",
+#endif
+};
/* Module params (documentation at end) */
static unsigned int num_devices = 1;
@@ -997,31 +1002,37 @@ static ssize_t max_comp_streams_store(st
return len;
}
-static ssize_t comp_algorithm_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+static void comp_algorithm_set(struct zram *zram, u32 idx, const char *alg)
{
- size_t sz;
- struct zram *zram = dev_to_zram(dev);
+ bool default_alg = false;
+ int i;
- down_read(&zram->init_lock);
- sz = zcomp_available_show(zram->comp_algs[ZRAM_PRIMARY_ZCOMP], buf);
- up_read(&zram->init_lock);
+ /* Do not kfree() algs that we didn't allocate, IOW the default ones */
+ for (i = 0; i < ZRAM_MAX_ZCOMPS; i++) {
+ if (zram->comp_algs[idx] == default_comp_algs[i]) {
+ default_alg = true;
+ break;
+ }
+ }
- return sz;
+ if (!default_alg)
+ kfree(zram->comp_algs[idx]);
+ zram->comp_algs[idx] = alg;
}
-static void comp_algorithm_set(struct zram *zram, u32 idx, const char *alg)
+static ssize_t __comp_algorithm_show(struct zram *zram, u32 idx, char *buf)
{
- /* Do not kfree() algs that we didn't allocate, IOW the default ones */
- if (zram->comp_algs[idx] != default_compressor)
- kfree(zram->comp_algs[idx]);
- zram->comp_algs[idx] = alg;
+ ssize_t sz;
+
+ down_read(&zram->init_lock);
+ sz = zcomp_available_show(zram->comp_algs[idx], buf);
+ up_read(&zram->init_lock);
+
+ return sz;
}
-static ssize_t comp_algorithm_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t len)
+static int __comp_algorithm_store(struct zram *zram, u32 idx, const char *buf)
{
- struct zram *zram = dev_to_zram(dev);
char *compressor;
size_t sz;
@@ -1050,11 +1061,55 @@ static ssize_t comp_algorithm_store(stru
return -EBUSY;
}
- comp_algorithm_set(zram, ZRAM_PRIMARY_ZCOMP, compressor);
+ comp_algorithm_set(zram, idx, compressor);
up_write(&zram->init_lock);
- return len;
+ return 0;
+}
+
+static ssize_t comp_algorithm_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct zram *zram = dev_to_zram(dev);
+
+ return __comp_algorithm_show(zram, ZRAM_PRIMARY_ZCOMP, buf);
+}
+
+static ssize_t comp_algorithm_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct zram *zram = dev_to_zram(dev);
+ int ret;
+
+ ret = __comp_algorithm_store(zram, ZRAM_PRIMARY_ZCOMP, buf);
+ return ret ? ret : len;
}
+#ifdef CONFIG_ZRAM_MULTI_COMP
+static ssize_t recomp_algorithm_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct zram *zram = dev_to_zram(dev);
+
+ return __comp_algorithm_show(zram, ZRAM_SECONDARY_ZCOMP, buf);
+}
+
+static ssize_t recomp_algorithm_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct zram *zram = dev_to_zram(dev);
+ int ret;
+
+ ret = __comp_algorithm_store(zram, ZRAM_SECONDARY_ZCOMP, buf);
+ return ret ? ret : len;
+}
+#endif
+
static ssize_t compact_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
@@ -1759,7 +1814,11 @@ static void zram_reset_device(struct zra
memset(&zram->stats, 0, sizeof(zram->stats));
reset_bdev(zram);
- comp_algorithm_set(zram, ZRAM_PRIMARY_ZCOMP, default_compressor);
+ comp_algorithm_set(zram, ZRAM_PRIMARY_ZCOMP,
+ default_comp_algs[ZRAM_PRIMARY_ZCOMP]);
+ if (IS_ENABLED(CONFIG_ZRAM_MULTI_COMP))
+ comp_algorithm_set(zram, ZRAM_SECONDARY_ZCOMP,
+ default_comp_algs[ZRAM_SECONDARY_ZCOMP]);
up_write(&zram->init_lock);
}
@@ -1892,6 +1951,9 @@ static DEVICE_ATTR_WO(writeback);
static DEVICE_ATTR_RW(writeback_limit);
static DEVICE_ATTR_RW(writeback_limit_enable);
#endif
+#ifdef CONFIG_ZRAM_MULTI_COMP
+static DEVICE_ATTR_RW(recomp_algorithm);
+#endif
static struct attribute *zram_disk_attrs[] = {
&dev_attr_disksize.attr,
@@ -1915,6 +1977,9 @@ static struct attribute *zram_disk_attrs
&dev_attr_bd_stat.attr,
#endif
&dev_attr_debug_stat.attr,
+#ifdef CONFIG_ZRAM_MULTI_COMP
+ &dev_attr_recomp_algorithm.attr,
+#endif
NULL,
};
@@ -1994,7 +2059,11 @@ static int zram_add(void)
if (ret)
goto out_cleanup_disk;
- zram->comp_algs[ZRAM_PRIMARY_ZCOMP] = default_compressor;
+ zram->comp_algs[ZRAM_PRIMARY_ZCOMP] =
+ default_comp_algs[ZRAM_PRIMARY_ZCOMP];
+ if (IS_ENABLED(CONFIG_ZRAM_MULTI_COMP))
+ zram->comp_algs[ZRAM_SECONDARY_ZCOMP] =
+ default_comp_algs[ZRAM_SECONDARY_ZCOMP];
zram_debugfs_register(zram);
pr_info("Added device: %s\n", zram->disk->disk_name);
_
Patches currently in -mm which might be from senozhatsky@xxxxxxxxxxxx are
zram-preparation-for-multi-zcomp-support.patch
zram-factor-out-wb-and-non-wb-zram-read-functions.patch
zram-introduce-recompress-sysfs-knob.patch
documentation-add-recompression-documentation.patch
zram-add-recompression-algorithm-choice-to-kconfig.patch
zram-add-recompress-flag-to-read_block_state.patch
zram-clarify-writeback_store-comment.patch
zram-use-is_err_value-to-check-for-zs_malloc-errors.patch
zsmalloc-turn-zspage-order-into-runtime-variable.patch
zsmalloc-move-away-from-page-order-defines.patch
zsmalloc-make-huge-class-watermark-zs_pool-member.patch
zram-huge-size-watermark-cannot-be-global.patch
zsmalloc-pass-limit-on-pages-per-zspage-to-zs_create_pool.patch
zram-add-pages_per_pool_page-device-attribute.patch
documentation-document-zram-pages_per_pool_page-attribute.patch
zsmalloc-break-out-of-loop-when-found-perfect-zspage-order.patch
