The patch titled
Subject: zram: support compression level comp config
has been added to the -mm mm-unstable branch. Its filename is
zram-support-compression-level-comp-config.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-support-compression-level-comp-config.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Subject: zram: support compression level comp config
Date: Wed, 15 May 2024 16:12:49 +0900
Add support for compression level level=N comp configuration to
comp_algorithm and recomp_algorithm knobs.
Note that zram cannot verify ranges, it's a task of corresponding backends
to make sure that level makes sense.
Link: https://lkml.kernel.org/r/20240515071645.1788128-13-senozhatsky@xxxxxxxxxxxx
Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nick Terrell <terrelln@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 30 ++++++++++++++++++++++++++++--
1 file changed, 28 insertions(+), 2 deletions(-)
--- a/drivers/block/zram/zram_drv.c~zram-support-compression-level-comp-config
+++ a/drivers/block/zram/zram_drv.c
@@ -998,6 +998,12 @@ static int __comp_algorithm_store(struct
return 0;
}
+static int comp_config_store(struct zram *zram, u32 prio, s32 level)
+{
+ zram->configs[prio].level = level;
+ return 0;
+}
+
static ssize_t comp_algorithm_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -1015,6 +1021,7 @@ static ssize_t comp_algorithm_store(stru
struct zram *zram = dev_to_zram(dev);
char *args, *param, *val;
char *alg = NULL;
+ s32 level = ZCOMP_CONFIG_NO_LEVEL;
int ret;
args = skip_spaces(buf);
@@ -1034,12 +1041,21 @@ static ssize_t comp_algorithm_store(stru
alg = val;
continue;
}
+
+ if (!strcmp(param, "level")) {
+ ret = kstrtoint(val, 10, &level);
+ if (ret)
+ return ret;
+ continue;
+ }
}
if (!alg)
return -EINVAL;
- ret = __comp_algorithm_store(zram, ZRAM_PRIMARY_COMP, alg);
+ ret = comp_config_store(zram, ZRAM_PRIMARY_COMP, level);
+ if (!ret)
+ ret = __comp_algorithm_store(zram, ZRAM_PRIMARY_COMP, alg);
return ret ? ret : len;
}
@@ -1072,6 +1088,7 @@ static ssize_t recomp_algorithm_store(st
int prio = ZRAM_SECONDARY_COMP;
char *args, *param, *val;
char *alg = NULL;
+ s32 level = ZCOMP_CONFIG_NO_LEVEL;
int ret;
args = skip_spaces(buf);
@@ -1092,6 +1109,13 @@ static ssize_t recomp_algorithm_store(st
return ret;
continue;
}
+
+ if (!strcmp(param, "level")) {
+ ret = kstrtoint(val, 10, &level);
+ if (ret)
+ return ret;
+ continue;
+ }
}
if (!alg)
@@ -1100,7 +1124,9 @@ static ssize_t recomp_algorithm_store(st
if (prio < ZRAM_SECONDARY_COMP || prio >= ZRAM_MAX_COMPS)
return -EINVAL;
- ret = __comp_algorithm_store(zram, prio, alg);
+ ret = comp_config_store(zram, prio, level);
+ if (!ret)
+ ret = __comp_algorithm_store(zram, prio, alg);
return ret ? ret : len;
}
#endif
_
Patches currently in -mm which might be from senozhatsky@xxxxxxxxxxxx are
zram-move-from-crypto-api-to-custom-comp-backends-api.patch
zram-add-lzo-and-lzorle-compression-backends-support.patch
zram-add-lz4-compression-backend-support.patch
zram-add-lz4hc-compression-backend-support.patch
zram-add-zstd-compression-backend-support.patch
zram-pass-estimated-src-size-hint-to-zstd.patch
zram-add-zlib-compression-backend-support.patch
zram-add-842-compression-backend-support.patch
zram-check-that-backends-array-has-at-least-one-backend.patch
zram-introduce-zcomp_config-structure.patch
zram-extend-comp_algorithm-attr-write-handling.patch
zram-support-compression-level-comp-config.patch
zram-add-support-for-dict-comp-config.patch
lib-zstd-export-api-needed-for-dictionary-support.patch
zram-add-dictionary-support-to-zstd-backend.patch
zram-add-config-init-release-backend-callbacks.patch
zram-share-dictionaries-between-per-cpu-contexts.patch
zram-add-dictionary-support-to-lz4.patch
lib-lz4hc-export-lz4_resetstreamhc-symbol.patch
zram-add-dictionary-support-to-lz4hc.patch
documentation-zram-add-documentation-for-algorithm-parameters.patch
