Subject: + zram-add-set_max_streams-knob.patch added to -mm tree To: sergey.senozhatsky@xxxxxxxxx,jmarchan@xxxxxxxxxx,minchan@xxxxxxxxxx,ngupta@xxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Fri, 28 Feb 2014 15:52:40 -0800 The patch titled Subject: zram: add set_max_streams knob has been added to the -mm tree. Its filename is zram-add-set_max_streams-knob.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/zram-add-set_max_streams-knob.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/zram-add-set_max_streams-knob.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> Subject: zram: add set_max_streams knob This patch allows to change max_comp_streams on initialised zcomp. Introduce zcomp set_max_streams() knob, zcomp_strm_multi_set_max_streams() and zcomp_strm_single_set_max_streams() callbacks to change streams limit for zcomp_strm_multi and zcomp_strm_single, accordingly. set_max_streams for single steam zcomp does nothing. If user has lowered the limit, then zcomp_strm_multi_set_max_streams() attempts to immediately free extra streams (as much as it can, depending on idle streams availability). Note, this patch does not allow to change stream 'policy' from single to multi stream (or vice versa) on already initialised compression backend. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Cc: Jerome Marchand <jmarchan@xxxxxxxxxx> Cc: Nitin Gupta <ngupta@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/block/zram/zcomp.c | 36 ++++++++++++++++++++++++++++++++ drivers/block/zram/zcomp.h | 3 ++ drivers/block/zram/zram_drv.c | 5 +--- 3 files changed, 41 insertions(+), 3 deletions(-) diff -puN drivers/block/zram/zcomp.c~zram-add-set_max_streams-knob drivers/block/zram/zcomp.c --- a/drivers/block/zram/zcomp.c~zram-add-set_max_streams-knob +++ a/drivers/block/zram/zcomp.c @@ -136,6 +136,29 @@ static void zcomp_strm_multi_release(str zcomp_strm_free(comp, zstrm); } +/* change max_strm limit */ +static int zcomp_strm_multi_set_max_streams(struct zcomp *comp, int num_strm) +{ + struct zcomp_strm_multi *zs = comp->stream; + struct zcomp_strm *zstrm; + + spin_lock(&zs->strm_lock); + zs->max_strm = num_strm; + /* + * if user has lowered the limit and there are idle streams, + * immediately free as much streams (and memory) as we can. + */ + while (zs->avail_strm > num_strm && !list_empty(&zs->idle_strm)) { + zstrm = list_entry(zs->idle_strm.next, + struct zcomp_strm, list); + list_del(&zstrm->list); + zcomp_strm_free(comp, zstrm); + zs->avail_strm--; + } + spin_unlock(&zs->strm_lock); + return 0; +} + static void zcomp_strm_multi_destroy(struct zcomp *comp) { struct zcomp_strm_multi *zs = comp->stream; @@ -158,6 +181,7 @@ static int zcomp_strm_multi_create(struc comp->destroy = zcomp_strm_multi_destroy; comp->strm_find = zcomp_strm_multi_find; comp->strm_release = zcomp_strm_multi_release; + comp->set_max_streams = zcomp_strm_multi_set_max_streams; zs = kmalloc(sizeof(struct zcomp_strm_multi), GFP_KERNEL); if (!zs) return -ENOMEM; @@ -192,6 +216,12 @@ static void zcomp_strm_single_release(st mutex_unlock(&zs->strm_lock); } +static int zcomp_strm_single_set_max_streams(struct zcomp *comp, int num_strm) +{ + /* zcomp_strm_single support only max_comp_streams == 1 */ + return -ENOTSUPP; +} + static void zcomp_strm_single_destroy(struct zcomp *comp) { struct zcomp_strm_single *zs = comp->stream; @@ -206,6 +236,7 @@ static int zcomp_strm_single_create(stru comp->destroy = zcomp_strm_single_destroy; comp->strm_find = zcomp_strm_single_find; comp->strm_release = zcomp_strm_single_release; + comp->set_max_streams = zcomp_strm_single_set_max_streams; zs = kmalloc(sizeof(struct zcomp_strm_single), GFP_KERNEL); if (!zs) return -ENOMEM; @@ -220,6 +251,11 @@ static int zcomp_strm_single_create(stru return 0; } +int zcomp_set_max_streams(struct zcomp *comp, int num_strm) +{ + return comp->set_max_streams(comp, num_strm); +} + struct zcomp_strm *zcomp_strm_find(struct zcomp *comp) { return comp->strm_find(comp); diff -puN drivers/block/zram/zcomp.h~zram-add-set_max_streams-knob drivers/block/zram/zcomp.h --- a/drivers/block/zram/zcomp.h~zram-add-set_max_streams-knob +++ a/drivers/block/zram/zcomp.h @@ -46,6 +46,7 @@ struct zcomp { struct zcomp_strm *(*strm_find)(struct zcomp *comp); void (*strm_release)(struct zcomp *comp, struct zcomp_strm *zstrm); + int (*set_max_streams)(struct zcomp *comp, int num_strm); void (*destroy)(struct zcomp *comp); }; @@ -60,4 +61,6 @@ int zcomp_compress(struct zcomp *comp, s int zcomp_decompress(struct zcomp *comp, const unsigned char *src, size_t src_len, unsigned char *dst); + +int zcomp_set_max_streams(struct zcomp *comp, int num_strm); #endif /* _ZCOMP_H_ */ diff -puN drivers/block/zram/zram_drv.c~zram-add-set_max_streams-knob drivers/block/zram/zram_drv.c --- a/drivers/block/zram/zram_drv.c~zram-add-set_max_streams-knob +++ a/drivers/block/zram/zram_drv.c @@ -133,9 +133,8 @@ static ssize_t max_comp_streams_store(st return -EINVAL; down_write(&zram->init_lock); if (init_done(zram)) { - up_write(&zram->init_lock); - pr_info("Can't set max_comp_streams for initialized device\n"); - return -EBUSY; + if (zcomp_set_max_streams(zram->comp, num)) + pr_info("Cannot change max compression streams\n"); } zram->max_comp_streams = num; up_write(&zram->init_lock); _ Patches currently in -mm which might be from sergey.senozhatsky@xxxxxxxxx are zram-drop-init_done-struct-zram-member.patch zram-do-not-pass-rw-argument-to-__zram_make_request.patch zram-remove-good-and-bad-compress-stats.patch zram-use-atomic64_t-for-all-zram-stats.patch zram-remove-zram-stats-code-duplication.patch zram-report-failed-read-and-write-stats.patch zram-drop-not-used-table-count-member.patch zram-move-zram-size-warning-to-documentation.patch zram-document-failed_reads-failed_writes-stats.patch zram-delete-zram_init_device.patch zram-introduce-compressing-backend-abstraction.patch zram-use-zcomp-compressing-backends.patch zram-factor-out-single-stream-compression.patch zram-add-multi-stream-functionality.patch zram-add-set_max_streams-knob.patch zram-make-compression-algorithm-selection-possible.patch zram-add-lz4-algorithm-backend.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html