The patch titled
Subject: zram: support priority parameter in recompression
has been added to the -mm mm-unstable branch. Its filename is
zram-support-priority-parameter-in-recompression.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-support-priority-parameter-in-recompression.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 priority parameter in recompression
Date: Mon, 2 Sep 2024 19:56:12 +0900
recompress device attribute supports alg=NAME parameter so that we can
specify only one particular algorithm we want to perform recompression
with. However, with algo params we now can have several exactly same
secondary algorithms but each with its own params tuning (e.g. priority 1
configured to use more aggressive level, and priority 2 configured to use
a pre-trained dictionary). Support priority=NUM parameter so that we can
correctly determine which secondary algorithm we want to use.
Link: https://lkml.kernel.org/r/20240902105656.1383858-25-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>
---
Documentation/admin-guide/blockdev/zram.rst | 5 ++++-
drivers/block/zram/zram_drv.c | 12 ++++++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
--- a/Documentation/admin-guide/blockdev/zram.rst~zram-support-priority-parameter-in-recompression
+++ a/Documentation/admin-guide/blockdev/zram.rst
@@ -512,11 +512,14 @@ registered compression algorithms, incre
algorithm that successfully compresses a particular page. Sometimes, however,
it is convenient (and sometimes even necessary) to limit recompression to
only one particular algorithm so that it will not try any other algorithms.
-This can be achieved by providing a algo=NAME parameter:::
+This can be achieved by providing a `algo` or `priority` parameter:::
#use zstd algorithm only (if registered)
echo "type=huge algo=zstd" > /sys/block/zramX/recompress
+ #use zstd algorithm only (if zstd was registered under priority 1)
+ echo "type=huge priority=1" > /sys/block/zramX/recompress
+
memory tracking
===============
--- a/drivers/block/zram/zram_drv.c~zram-support-priority-parameter-in-recompression
+++ a/drivers/block/zram/zram_drv.c
@@ -1855,6 +1855,18 @@ static ssize_t recompress_store(struct d
algo = val;
continue;
}
+
+ if (!strcmp(param, "priority")) {
+ ret = kstrtouint(val, 10, &prio);
+ if (ret)
+ return ret;
+
+ if (prio == ZRAM_PRIMARY_COMP)
+ prio = ZRAM_SECONDARY_COMP;
+
+ prio_max = min(prio + 1, ZRAM_MAX_COMPS);
+ continue;
+ }
}
if (threshold >= huge_class_size)
_
Patches currently in -mm which might be from senozhatsky@xxxxxxxxxxxx are
lib-zstd-export-api-needed-for-dictionary-support.patch
lib-lz4hc-export-lz4_resetstreamhc-symbol.patch
lib-zstd-fix-null-deref-in-zstd_createcdict_advanced2.patch
zram-introduce-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_params-structure.patch
zram-recalculate-zstd-compression-params-once.patch
zram-introduce-algorithm_params-device-attribute.patch
zram-add-support-for-dict-comp-config.patch
zram-introduce-zcomp_req-structure.patch
zram-introduce-zcomp_ctx-structure.patch
zram-move-immutable-comp-params-away-from-per-cpu-context.patch
zram-add-dictionary-support-to-lz4.patch
zram-add-dictionary-support-to-lz4hc.patch
zram-add-dictionary-support-to-zstd-backend.patch
documentation-zram-add-documentation-for-algorithm-parameters.patch
zram-support-priority-parameter-in-recompression.patch
