search for: pages_per_zspag

...03,6 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) > init_zspage(class, first_page); > > first_page->freelist = location_to_obj(first_page, 0); > - /* Maximum number of objects we can store in this zspage */ > - first_page->objects = class->pages_per_zspage * PAGE_SIZE / class->size; > - > error = 0; /* Success */ > > cleanup: > @@ -1235,11 +1232,11 @@ static bool can_merge(struct size_class *prev, int size, int pages_per_zspage) > return true; > } > > -static bool zspage_full(struct page *first_page) > +sta...

...03,6 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) > init_zspage(class, first_page); > > first_page->freelist = location_to_obj(first_page, 0); > - /* Maximum number of objects we can store in this zspage */ > - first_page->objects = class->pages_per_zspage * PAGE_SIZE / class->size; > - > error = 0; /* Success */ > > cleanup: > @@ -1235,11 +1232,11 @@ static bool can_merge(struct size_class *prev, int size, int pages_per_zspage) > return true; > } > > -static bool zspage_full(struct page *first_page) > +sta...

...page *alloc_zspage(struct size_class *class, gfp_t flags) > > init_zspage(class, first_page); > > > > first_page->freelist = location_to_obj(first_page, 0); > >- /* Maximum number of objects we can store in this zspage */ > >- first_page->objects = class->pages_per_zspage * PAGE_SIZE / class->size; > >- > > error = 0; /* Success */ > > > > cleanup: > >@@ -1235,11 +1232,11 @@ static bool can_merge(struct size_class *prev, int size, int pages_per_zspage) > > return true; > > } > > > >-static bool zspage_f...

...oto out; @@ -1008,9 +1008,6 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) init_zspage(class, first_page); first_page->freelist = location_to_obj(first_page, 0); - /* Maximum number of objects we can store in this zspage */ - first_page->objects = class->pages_per_zspage * PAGE_SIZE / class->size; - error = 0; /* Success */ cleanup: @@ -1238,11 +1235,11 @@ static bool can_merge(struct size_class *prev, int size, int pages_per_zspage) return true; } -static bool zspage_full(struct page *first_page) +static bool zspage_full(struct size_class *class, str...

...class, + struct page *first_page) { struct page *nextp, *tmp, *head_extra; @@ -972,6 +973,11 @@ static void free_zspage(struct page *first_page) } reset_page(head_extra); __free_page(head_extra); + + zs_stat_dec(class, OBJ_ALLOCATED, get_maxobj_per_zspage( + class->size, class->pages_per_zspage)); + atomic_long_sub(class->pages_per_zspage, + &pool->pages_allocated); } /* Initialize a newly allocated zspage */ @@ -1559,13 +1565,8 @@ void zs_free(struct zs_pool *pool, unsigned long handle) spin_lock(&class->lock); obj_free(class, obj); fullness = fix_fullness_...

...oto out; @@ -1003,9 +1003,6 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) init_zspage(class, first_page); first_page->freelist = location_to_obj(first_page, 0); - /* Maximum number of objects we can store in this zspage */ - first_page->objects = class->pages_per_zspage * PAGE_SIZE / class->size; - error = 0; /* Success */ cleanup: @@ -1235,11 +1232,11 @@ static bool can_merge(struct size_class *prev, int size, int pages_per_zspage) return true; } -static bool zspage_full(struct page *first_page) +static bool zspage_full(struct size_class *class, str...

...== ZS_EMPTY, dst_page); well, if we want to VM_BUG_ON_PAGE() at all. there haven't been any problems with compaction, is there any specific reason these macros were added? > + if (putback_zspage(pool, class, src_page) == ZS_EMPTY) { > pool->stats.pages_compacted += class->pages_per_zspage; > - spin_unlock(&class->lock); > + spin_unlock(&class->lock); > + free_zspage(pool, class, src_page); do we really need to free_zspage() out of class->lock? wouldn't something like this if (putback_zspage(pool, class, src_page) == ZS_EMPTY) { pool->sta...

...== ZS_EMPTY, dst_page); well, if we want to VM_BUG_ON_PAGE() at all. there haven't been any problems with compaction, is there any specific reason these macros were added? > + if (putback_zspage(pool, class, src_page) == ZS_EMPTY) { > pool->stats.pages_compacted += class->pages_per_zspage; > - spin_unlock(&class->lock); > + spin_unlock(&class->lock); > + free_zspage(pool, class, src_page); do we really need to free_zspage() out of class->lock? wouldn't something like this if (putback_zspage(pool, class, src_page) == ZS_EMPTY) { pool->sta...

Recently, I got many reports about perfermance degradation in embedded system(Android mobile phone, webOS TV and so on) and failed to fork easily. The problem was fragmentation caused by zram and GPU driver pages. Their pages cannot be migrated so compaction cannot work well, either so reclaimer ends up shrinking all of working set pages. It made system very slow and even to fail to fork easily.

Recently, I got many reports about perfermance degradation in embedded system(Android mobile phone, webOS TV and so on) and failed to fork easily. The problem was fragmentation caused by zram and GPU driver pages. Their pages cannot be migrated so compaction cannot work well, either so reclaimer ends up shrinking all of working set pages. It made system very slow and even to fail to fork easily.

...gePrivate2(page); + + prev_page = page; + } +} + /* * Allocate a zspage for the given size class */ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) { - int i, error; + int i; struct page *first_page = NULL, *uninitialized_var(prev_page); + struct page *pages[ZS_MAX_PAGES_PER_ZSPAGE]; /* * Allocate individual pages and link them together as: @@ -1041,43 +1074,23 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) * (i.e. no other sub-page has this flag set) and PG_private_2 to * identify the last page. */ - error = -ENOMEM; for (i = 0;...

...page; + } +} + /* * Allocate a zspage for the given size class */ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) { - int i, error; - struct page *first_page = NULL, *uninitialized_var(prev_page); + int i; + struct page *first_page = NULL; + struct page *pages[ZS_MAX_PAGES_PER_ZSPAGE]; /* * Allocate individual pages and link them together as: @@ -1045,43 +1078,23 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) * (i.e. no other sub-page has this flag set) and PG_private_2 to * identify the last page. */ - error = -ENOMEM; for (i = 0;...

...gt; /* > * Allocate a zspage for the given size class > */ > static struct page *alloc_zspage(struct size_class *class, gfp_t flags) > { > - int i, error; > + int i; > struct page *first_page = NULL, *uninitialized_var(prev_page); > + struct page *pages[ZS_MAX_PAGES_PER_ZSPAGE]; > > /* > * Allocate individual pages and link them together as: > @@ -1041,43 +1074,23 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) *uninitialized_var(prev_page) in alloc_zspage is not in use more. > * (i.e. no other sub-page has this fl...

...gt; /* > * Allocate a zspage for the given size class > */ > static struct page *alloc_zspage(struct size_class *class, gfp_t flags) > { > - int i, error; > + int i; > struct page *first_page = NULL, *uninitialized_var(prev_page); > + struct page *pages[ZS_MAX_PAGES_PER_ZSPAGE]; > > /* > * Allocate individual pages and link them together as: > @@ -1041,43 +1074,23 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) *uninitialized_var(prev_page) in alloc_zspage is not in use more. > * (i.e. no other sub-page has this fl...

Recently, I got many reports about perfermance degradation in embedded system(Android mobile phone, webOS TV and so on) and failed to fork easily. The problem was fragmentation caused by zram and GPU driver pages. Their pages cannot be migrated so compaction cannot work well, either so reclaimer ends up shrinking all of working set pages. It made system very slow and even to fail to fork easily.

Recently, I got many reports about perfermance degradation in embedded system(Android mobile phone, webOS TV and so on) and failed to fork easily. The problem was fragmentation caused by zram and GPU driver pages. Their pages cannot be migrated so compaction cannot work well, either so reclaimer ends up shrinking all of working set pages. It made system very slow and even to fail to fork easily.

...we want to VM_BUG_ON_PAGE() at all. there haven't been any > problems with compaction, is there any specific reason these macros > were added? > > > > > + if (putback_zspage(pool, class, src_page) == ZS_EMPTY) { > > pool->stats.pages_compacted += class->pages_per_zspage; > > - spin_unlock(&class->lock); > > + spin_unlock(&class->lock); > > + free_zspage(pool, class, src_page); > > do we really need to free_zspage() out of class->lock? > wouldn't something like this > > if (putback_zspage(pool, class,...

Recently, I got many reports about perfermance degradation in embedded system(Android mobile phone, webOS TV and so on) and failed to fork easily. The problem was fragmentation caused by zram and GPU driver pages. Their pages cannot be migrated so compaction cannot work well, either so reclaimer ends up shrinking all of working set pages. It made system very slow and even to fail to fork easily.

Recently, I got many reports about perfermance degradation in embedded system(Android mobile phone, webOS TV and so on) and failed to fork easily. The problem was fragmentation caused by zram and GPU driver pages. Their pages cannot be migrated so compaction cannot work well, either so reclaimer ends up shrinking all of working set pages. It made system very slow and even to fail to fork easily.

...e8 00 00 00 00 callq 6401 <zs_compact+0x2b6> > 6401: 48 8b 85 b0 fe ff ff mov -0x150(%rbp),%rax RAX: 2065676162726166 so rax is totally garbage, I think. It means obj_to_head returns garbage because get_first_obj_offset is utter crab because (page_idx / class->pages_per_zspage) was totally wrong. > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > 6408: f0 0f ba 28 00 lock btsl $0x0,(%rax) <snip> > > Could you test with [zsmalloc: keep first object offset in struct page] > > in mmotm? > > sure, I can. will it help, tho? we...