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Date: Wed, 31 Jul 2019 16:00:27 +0200
From: Javier González <javier@...igon.com>
To: Hans Holmberg <hans@...tronix.com>
Cc: Matias Bjørling <mb@...htnvm.io>,
Christoph Hellwig <hch@....de>, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] lightnvm: pblk: use kvmalloc for metadata
> On 31 Jul 2019, at 11.41, Hans Holmberg <hans@...tronix.com> wrote:
>
> There is no reason now not to use kvmalloc, so
> so replace the internal metadata allocation scheme.
2 x so
>
> Signed-off-by: Hans Holmberg <hans@...tronix.com>
> ---
> drivers/lightnvm/pblk-core.c | 3 +--
> drivers/lightnvm/pblk-gc.c | 19 ++++++++-----------
> drivers/lightnvm/pblk-init.c | 38 ++++++++++----------------------------
> drivers/lightnvm/pblk.h | 23 -----------------------
> 4 files changed, 19 insertions(+), 64 deletions(-)
>
> diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
> index a58d3c84a3f2..b413bafe93fd 100644
> --- a/drivers/lightnvm/pblk-core.c
> +++ b/drivers/lightnvm/pblk-core.c
> @@ -1839,8 +1839,7 @@ static void pblk_save_lba_list(struct pblk *pblk, struct pblk_line *line)
> struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
> struct pblk_emeta *emeta = line->emeta;
>
> - w_err_gc->lba_list = pblk_malloc(lba_list_size,
> - l_mg->emeta_alloc_type, GFP_KERNEL);
> + w_err_gc->lba_list = kvmalloc(lba_list_size, GFP_KERNEL);
> memcpy(w_err_gc->lba_list, emeta_to_lbas(pblk, emeta->buf),
> lba_list_size);
> }
> diff --git a/drivers/lightnvm/pblk-gc.c b/drivers/lightnvm/pblk-gc.c
> index 63ee205b41c4..2581eebcfc41 100644
> --- a/drivers/lightnvm/pblk-gc.c
> +++ b/drivers/lightnvm/pblk-gc.c
> @@ -132,14 +132,12 @@ static __le64 *get_lba_list_from_emeta(struct pblk *pblk,
> struct pblk_line *line)
> {
> struct line_emeta *emeta_buf;
> - struct pblk_line_mgmt *l_mg = &pblk->l_mg;
> struct pblk_line_meta *lm = &pblk->lm;
> unsigned int lba_list_size = lm->emeta_len[2];
> __le64 *lba_list;
> int ret;
>
> - emeta_buf = pblk_malloc(lm->emeta_len[0],
> - l_mg->emeta_alloc_type, GFP_KERNEL);
> + emeta_buf = kvmalloc(lm->emeta_len[0], GFP_KERNEL);
> if (!emeta_buf)
> return NULL;
>
> @@ -147,7 +145,7 @@ static __le64 *get_lba_list_from_emeta(struct pblk *pblk,
> if (ret) {
> pblk_err(pblk, "line %d read emeta failed (%d)\n",
> line->id, ret);
> - pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);
> + kvfree(emeta_buf);
> return NULL;
> }
>
> @@ -161,16 +159,16 @@ static __le64 *get_lba_list_from_emeta(struct pblk *pblk,
> if (ret) {
> pblk_err(pblk, "inconsistent emeta (line %d)\n",
> line->id);
> - pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);
> + kvfree(emeta_buf);
> return NULL;
> }
>
> - lba_list = pblk_malloc(lba_list_size,
> - l_mg->emeta_alloc_type, GFP_KERNEL);
> + lba_list = kvmalloc(lba_list_size, GFP_KERNEL);
> +
> if (lba_list)
> memcpy(lba_list, emeta_to_lbas(pblk, emeta_buf), lba_list_size);
>
> - pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);
> + kvfree(emeta_buf);
>
> return lba_list;
> }
> @@ -181,7 +179,6 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
> ws);
> struct pblk *pblk = line_ws->pblk;
> struct pblk_line *line = line_ws->line;
> - struct pblk_line_mgmt *l_mg = &pblk->l_mg;
> struct pblk_line_meta *lm = &pblk->lm;
> struct nvm_tgt_dev *dev = pblk->dev;
> struct nvm_geo *geo = &dev->geo;
> @@ -272,7 +269,7 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
> goto next_rq;
>
> out:
> - pblk_mfree(lba_list, l_mg->emeta_alloc_type);
> + kvfree(lba_list);
> kfree(line_ws);
> kfree(invalid_bitmap);
>
> @@ -286,7 +283,7 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
> fail_free_gc_rq:
> kfree(gc_rq);
> fail_free_lba_list:
> - pblk_mfree(lba_list, l_mg->emeta_alloc_type);
> + kvfree(lba_list);
> fail_free_invalid_bitmap:
> kfree(invalid_bitmap);
> fail_free_ws:
> diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
> index b351c7f002de..9a967a2e83dd 100644
> --- a/drivers/lightnvm/pblk-init.c
> +++ b/drivers/lightnvm/pblk-init.c
> @@ -543,7 +543,7 @@ static void pblk_line_mg_free(struct pblk *pblk)
>
> for (i = 0; i < PBLK_DATA_LINES; i++) {
> kfree(l_mg->sline_meta[i]);
> - pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
> + kvfree(l_mg->eline_meta[i]->buf);
> kfree(l_mg->eline_meta[i]);
> }
>
> @@ -560,7 +560,7 @@ static void pblk_line_meta_free(struct pblk_line_mgmt *l_mg,
> kfree(line->erase_bitmap);
> kfree(line->chks);
>
> - pblk_mfree(w_err_gc->lba_list, l_mg->emeta_alloc_type);
> + kvfree(w_err_gc->lba_list);
> kfree(w_err_gc);
> }
>
> @@ -890,29 +890,14 @@ static int pblk_line_mg_init(struct pblk *pblk)
> if (!emeta)
> goto fail_free_emeta;
>
> - if (lm->emeta_len[0] > KMALLOC_MAX_CACHE_SIZE) {
> - l_mg->emeta_alloc_type = PBLK_VMALLOC_META;
> -
> - emeta->buf = vmalloc(lm->emeta_len[0]);
> - if (!emeta->buf) {
> - kfree(emeta);
> - goto fail_free_emeta;
> - }
> -
> - emeta->nr_entries = lm->emeta_sec[0];
> - l_mg->eline_meta[i] = emeta;
> - } else {
> - l_mg->emeta_alloc_type = PBLK_KMALLOC_META;
> -
> - emeta->buf = kmalloc(lm->emeta_len[0], GFP_KERNEL);
> - if (!emeta->buf) {
> - kfree(emeta);
> - goto fail_free_emeta;
> - }
> -
> - emeta->nr_entries = lm->emeta_sec[0];
> - l_mg->eline_meta[i] = emeta;
> + emeta->buf = kvmalloc(lm->emeta_len[0], GFP_KERNEL);
> + if (!emeta->buf) {
> + kfree(emeta);
> + goto fail_free_emeta;
> }
> +
> + emeta->nr_entries = lm->emeta_sec[0];
> + l_mg->eline_meta[i] = emeta;
> }
>
> for (i = 0; i < l_mg->nr_lines; i++)
> @@ -926,10 +911,7 @@ static int pblk_line_mg_init(struct pblk *pblk)
>
> fail_free_emeta:
> while (--i >= 0) {
> - if (l_mg->emeta_alloc_type == PBLK_VMALLOC_META)
> - vfree(l_mg->eline_meta[i]->buf);
> - else
> - kfree(l_mg->eline_meta[i]->buf);
> + kvfree(l_mg->eline_meta[i]->buf);
> kfree(l_mg->eline_meta[i]);
> }
>
> diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
> index d515d3409a74..86ffa875bfe1 100644
> --- a/drivers/lightnvm/pblk.h
> +++ b/drivers/lightnvm/pblk.h
> @@ -482,11 +482,6 @@ struct pblk_line {
> #define PBLK_DATA_LINES 4
>
> enum {
> - PBLK_KMALLOC_META = 1,
> - PBLK_VMALLOC_META = 2,
> -};
> -
> -enum {
> PBLK_EMETA_TYPE_HEADER = 1, /* struct line_emeta first sector */
> PBLK_EMETA_TYPE_LLBA = 2, /* lba list - type: __le64 */
> PBLK_EMETA_TYPE_VSC = 3, /* vsc list - type: __le32 */
> @@ -521,9 +516,6 @@ struct pblk_line_mgmt {
>
> __le32 *vsc_list; /* Valid sector counts for all lines */
>
> - /* Metadata allocation type: VMALLOC | KMALLOC */
> - int emeta_alloc_type;
> -
> /* Pre-allocated metadata for data lines */
> struct pblk_smeta *sline_meta[PBLK_DATA_LINES];
> struct pblk_emeta *eline_meta[PBLK_DATA_LINES];
> @@ -934,21 +926,6 @@ void pblk_rl_werr_line_out(struct pblk_rl *rl);
> int pblk_sysfs_init(struct gendisk *tdisk);
> void pblk_sysfs_exit(struct gendisk *tdisk);
>
> -static inline void *pblk_malloc(size_t size, int type, gfp_t flags)
> -{
> - if (type == PBLK_KMALLOC_META)
> - return kmalloc(size, flags);
> - return vmalloc(size);
> -}
> -
> -static inline void pblk_mfree(void *ptr, int type)
> -{
> - if (type == PBLK_KMALLOC_META)
> - kfree(ptr);
> - else
> - vfree(ptr);
> -}
> -
> static inline struct nvm_rq *nvm_rq_from_c_ctx(void *c_ctx)
> {
> return c_ctx - sizeof(struct nvm_rq);
> --
> 2.7.4
Looks good to me.
Reviewed-by: Javier González <javier@...igon.com>
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