From 48d4bf3b05a683539a43faa02c6f3091c715c9cc Mon Sep 17 00:00:00 2001 From: Gao Xiang Date: Fri, 23 Nov 2018 01:21:46 +0800 Subject: [PATCH] staging: erofs: separate into init_once / always `z_erofs_vle_workgroup' is heavily generated in the decompression, for example, it resets 32 bytes redundantly for 64-bit platforms even through Z_EROFS_VLE_INLINE_PAGEVECS + Z_EROFS_CLUSTER_MAX_PAGES, default 4, pages are stored in `z_erofs_vle_workgroup'. As an another example, `struct mutex' takes 72 bytes for our kirin 64-bit platforms, it's unnecessary to be reseted at first and be initialized each time. Let's avoid filling all `z_erofs_vle_workgroup' with 0 at first since most fields are reinitialized to meaningful values later, and pagevec is no need to initialized at all. Reviewed-by: Chao Yu Signed-off-by: Gao Xiang Signed-off-by: Greg Kroah-Hartman --- drivers/staging/erofs/unzip_vle.c | 34 ++++++++++++++++++++++++++----- 1 file changed, 29 insertions(+), 5 deletions(-) diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c index ede3383ac601..4e5843e8ee35 100644 --- a/drivers/staging/erofs/unzip_vle.c +++ b/drivers/staging/erofs/unzip_vle.c @@ -43,12 +43,38 @@ static inline int init_unzip_workqueue(void) return z_erofs_workqueue ? 0 : -ENOMEM; } +static void init_once(void *ptr) +{ + struct z_erofs_vle_workgroup *grp = ptr; + struct z_erofs_vle_work *const work = + z_erofs_vle_grab_primary_work(grp); + unsigned int i; + + mutex_init(&work->lock); + work->nr_pages = 0; + work->vcnt = 0; + for (i = 0; i < Z_EROFS_CLUSTER_MAX_PAGES; ++i) + grp->compressed_pages[i] = NULL; +} + +static void init_always(struct z_erofs_vle_workgroup *grp) +{ + struct z_erofs_vle_work *const work = + z_erofs_vle_grab_primary_work(grp); + + atomic_set(&grp->obj.refcount, 1); + grp->flags = 0; + + DBG_BUGON(work->nr_pages); + DBG_BUGON(work->vcnt); +} + int __init z_erofs_init_zip_subsystem(void) { z_erofs_workgroup_cachep = kmem_cache_create("erofs_compress", Z_EROFS_WORKGROUP_SIZE, 0, - SLAB_RECLAIM_ACCOUNT, NULL); + SLAB_RECLAIM_ACCOUNT, init_once); if (z_erofs_workgroup_cachep) { if (!init_unzip_workqueue()) @@ -370,10 +396,11 @@ z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f, BUG_ON(grp); /* no available workgroup, let's allocate one */ - grp = kmem_cache_zalloc(z_erofs_workgroup_cachep, GFP_NOFS); + grp = kmem_cache_alloc(z_erofs_workgroup_cachep, GFP_NOFS); if (unlikely(!grp)) return ERR_PTR(-ENOMEM); + init_always(grp); grp->obj.index = f->idx; grp->llen = map->m_llen; @@ -381,7 +408,6 @@ z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f, (map->m_flags & EROFS_MAP_ZIPPED) ? Z_EROFS_VLE_WORKGRP_FMT_LZ4 : Z_EROFS_VLE_WORKGRP_FMT_PLAIN); - atomic_set(&grp->obj.refcount, 1); /* new workgrps have been claimed as type 1 */ WRITE_ONCE(grp->next, *f->owned_head); @@ -394,8 +420,6 @@ z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f, work = z_erofs_vle_grab_primary_work(grp); work->pageofs = f->pageofs; - mutex_init(&work->lock); - if (gnew) { int err = erofs_register_workgroup(f->sb, &grp->obj, 0); -- 2.30.2