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Wed, 09 Nov 2022 03:51:20 -0800 (PST) From: Sergey Senozhatsky To: Minchan Kim , Andrew Morton Cc: Nitin Gupta , Suleiman Souhlal , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Sergey Senozhatsky Subject: [PATCHv5 10/13] zram: Add algo parameter support to zram_recompress() Date: Wed, 9 Nov 2022 20:50:44 +0900 Message-Id: <20221109115047.2921851-11-senozhatsky@chromium.org> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog In-Reply-To: <20221109115047.2921851-1-senozhatsky@chromium.org> References: <20221109115047.2921851-1-senozhatsky@chromium.org> MIME-Version: 1.0 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1667994718; a=rsa-sha256; cv=none; b=JfjyK0e2CGV8EkQMpVWgxS4DPr1+Ey2iIh9g3Vj3leThCBu7Yn7ZtEoSU1LpAiG/DNnNrX ogEG2yS2t3YMHTlJ09zqHuHoAlVNGZlqe/YVvm7oJYX96gCS8Yi6NNgNmDLg3LwSaX+fvI N5ZMRfBSvPyavYwFF/sHsh8RLBO+eC4= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=dCtnfolV; dmarc=pass (policy=none) header.from=chromium.org; 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This, however, may not always be best approach and sometimes we may want to limit recompression to only one particular algorithm. For instance, when a higher priority algorithm uses too much power and device has a relatively low battery level we may want to limit recompression to use only a lower priority algorithm, which uses less power. Introduce algo= parameter support to recompression sysfs knob so that user-sapce can request recompression with particular algorithm only: echo "type=idle algo=zstd" > /sys/block/zramX/recompress Signed-off-by: Sergey Senozhatsky --- drivers/block/zram/zram_drv.c | 54 +++++++++++++++++++++++++++++------ drivers/block/zram/zram_drv.h | 1 + 2 files changed, 46 insertions(+), 9 deletions(-) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 67b58f2255db..89d25f60b33e 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1677,6 +1677,7 @@ static int zram_recompress(struct zram *zram, u32 index, struct page *page, unsigned int comp_len_new; unsigned int class_index_old; unsigned int class_index_new; + u32 num_recomps = 0; void *src, *dst; int ret; @@ -1711,6 +1712,7 @@ static int zram_recompress(struct zram *zram, u32 index, struct page *page, if (prio <= zram_get_priority(zram, index)) continue; + num_recomps++; zstrm = zcomp_stream_get(zram->comps[prio]); src = kmap_atomic(page); ret = zcomp_compress(zstrm, src, &comp_len_new); @@ -1743,13 +1745,19 @@ static int zram_recompress(struct zram *zram, u32 index, struct page *page, if (!zstrm) return 0; - /* - * All secondary algorithms failed to re-compress the page in a way - * that would save memory, mark the object as incompressible so that - * we will not try to compress it again. - */ if (class_index_new >= class_index_old) { - zram_set_flag(zram, index, ZRAM_INCOMPRESSIBLE); + /* + * Secondary algorithms failed to re-compress the page + * in a way that would save memory, mark the object as + * incompressible so that we will not try to compress + * it again. + * + * We need to make sure that all secondary algorithms have + * failed, so we test if the number of recompressions matches + * the number of active secondary algorithms. + */ + if (num_recomps == zram->num_active_comps - 1) + zram_set_flag(zram, index, ZRAM_INCOMPRESSIBLE); return 0; } @@ -1798,10 +1806,11 @@ static ssize_t recompress_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { + u32 prio = ZRAM_SECONDARY_COMP, prio_max = ZRAM_MAX_COMPS; struct zram *zram = dev_to_zram(dev); - u32 mode = 0, threshold = 0, prio = ZRAM_SECONDARY_COMP; unsigned long nr_pages = zram->disksize >> PAGE_SHIFT; - char *args, *param, *val; + char *args, *param, *val, *algo = NULL; + u32 mode = 0, threshold = 0; unsigned long index; struct page *page; ssize_t ret; @@ -1833,6 +1842,11 @@ static ssize_t recompress_store(struct device *dev, return ret; continue; } + + if (!strcmp(param, "algo")) { + algo = val; + continue; + } } if (threshold >= PAGE_SIZE) @@ -1844,6 +1858,26 @@ static ssize_t recompress_store(struct device *dev, goto release_init_lock; } + if (algo) { + bool found = false; + + for (; prio < ZRAM_MAX_COMPS; prio++) { + if (!zram->comp_algs[prio]) + continue; + + if (!strcmp(zram->comp_algs[prio], algo)) { + prio_max = min(prio + 1, ZRAM_MAX_COMPS); + found = true; + break; + } + } + + if (!found) { + ret = -EINVAL; + goto release_init_lock; + } + } + page = alloc_page(GFP_KERNEL); if (!page) { ret = -ENOMEM; @@ -1874,7 +1908,7 @@ static ssize_t recompress_store(struct device *dev, goto next; err = zram_recompress(zram, index, page, threshold, - prio, ZRAM_MAX_COMPS); + prio, prio_max); next: zram_slot_unlock(zram, index); if (err) { @@ -2110,6 +2144,7 @@ static void zram_destroy_comps(struct zram *zram) if (!comp) continue; zcomp_destroy(comp); + zram->num_active_comps--; } } @@ -2177,6 +2212,7 @@ static ssize_t disksize_store(struct device *dev, } zram->comps[prio] = comp; + zram->num_active_comps++; } zram->disksize = disksize; set_capacity_and_notify(zram->disk, zram->disksize >> SECTOR_SHIFT); diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index b80faae76835..473325415a74 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -125,6 +125,7 @@ struct zram { */ u64 disksize; /* bytes */ const char *comp_algs[ZRAM_MAX_COMPS]; + s8 num_active_comps; /* * zram is claimed so open request will be failed */