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authorSergey Senozhatsky <senozhatsky@chromium.org>2024-09-02 12:56:03 +0200
committerAndrew Morton <akpm@linux-foundation.org>2024-09-10 01:39:09 +0200
commit4eac932103a5d8c3a1bdf6776dbc1a178c31d896 (patch)
tree8a2caaf827dcd6150c15d3f6571b99a655285227 /drivers
parentzram: recalculate zstd compression params once (diff)
downloadlinux-4eac932103a5d8c3a1bdf6776dbc1a178c31d896.tar.xz
linux-4eac932103a5d8c3a1bdf6776dbc1a178c31d896.zip
zram: introduce algorithm_params device attribute
This attribute is used to setup compression algorithms' parameters, so we can tweak algorithms' characteristics. At this point only 'level' is supported (to be extended in the future). Each call sets up parameters for one particular algorithm, which should be specified either by the algorithm's priority or algo name. This is expected to be called after corresponding algorithm is selected via comp_algorithm or recomp_algorithm. echo "priority=0 level=1" > /sys/block/zram0/algorithm_params or echo "algo=zstd level=1" > /sys/block/zram0/algorithm_params Link: https://lkml.kernel.org/r/20240902105656.1383858-16-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Nick Terrell <terrelln@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/zram/zram_drv.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index ff6724bbdf91..e29e952b99c3 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -998,6 +998,72 @@ static int __comp_algorithm_store(struct zram *zram, u32 prio, const char *buf)
return 0;
}
+static int comp_params_store(struct zram *zram, u32 prio, s32 level)
+{
+ zram->params[prio].level = level;
+ return 0;
+}
+
+static ssize_t algorithm_params_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ s32 prio = ZRAM_PRIMARY_COMP, level = ZCOMP_PARAM_NO_LEVEL;
+ char *args, *param, *val, *algo = NULL;
+ struct zram *zram = dev_to_zram(dev);
+ int ret;
+
+ args = skip_spaces(buf);
+ while (*args) {
+ args = next_arg(args, &param, &val);
+
+ if (!val || !*val)
+ return -EINVAL;
+
+ if (!strcmp(param, "priority")) {
+ ret = kstrtoint(val, 10, &prio);
+ if (ret)
+ return ret;
+ continue;
+ }
+
+ if (!strcmp(param, "level")) {
+ ret = kstrtoint(val, 10, &level);
+ if (ret)
+ return ret;
+ continue;
+ }
+
+ if (!strcmp(param, "algo")) {
+ algo = val;
+ continue;
+ }
+ }
+
+ /* Lookup priority by algorithm name */
+ if (algo) {
+ s32 p;
+
+ prio = -EINVAL;
+ for (p = ZRAM_PRIMARY_COMP; p < ZRAM_MAX_COMPS; p++) {
+ if (!zram->comp_algs[p])
+ continue;
+
+ if (!strcmp(zram->comp_algs[p], algo)) {
+ prio = p;
+ break;
+ }
+ }
+ }
+
+ if (prio < ZRAM_PRIMARY_COMP || prio >= ZRAM_MAX_COMPS)
+ return -EINVAL;
+
+ ret = comp_params_store(zram, prio, level);
+ return ret ? ret : len;
+}
+
static ssize_t comp_algorithm_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -2169,6 +2235,7 @@ static DEVICE_ATTR_RW(writeback_limit_enable);
static DEVICE_ATTR_RW(recomp_algorithm);
static DEVICE_ATTR_WO(recompress);
#endif
+static DEVICE_ATTR_WO(algorithm_params);
static struct attribute *zram_disk_attrs[] = {
&dev_attr_disksize.attr,
@@ -2196,6 +2263,7 @@ static struct attribute *zram_disk_attrs[] = {
&dev_attr_recomp_algorithm.attr,
&dev_attr_recompress.attr,
#endif
+ &dev_attr_algorithm_params.attr,
NULL,
};