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apply the slab_defrag patch to the nginx core by default.

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This commit is contained in:
Yichun Zhang (agentzh)
2014-05-06 13:16:59 -07:00
parent 9c3a123035
commit 1dbd0b24d2
2 changed files with 104 additions and 0 deletions
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100
patches/nginx-1.7.0-slab_defrag.patch Normal file
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@ -0,0 +1,100 @@
diff -r 7586e7b2dbe9 src/core/ngx_slab.c
--- a/src/core/ngx_slab.c Tue Feb 18 17:30:40 2014 +0400
+++ b/src/core/ngx_slab.c Tue May 06 12:32:22 2014 -0700
@@ -118,6 +118,7 @@
pool->pages->slab = pages;
pool->pages->next = &pool->free;
pool->pages->prev = (uintptr_t) &pool->free;
+ pool->pages->prev_slab = 0;
pool->start = (u_char *)
ngx_align_ptr((uintptr_t) p + pages * sizeof(ngx_slab_page_t),
@@ -628,6 +629,7 @@
page[pages].slab = page->slab - pages;
page[pages].next = page->next;
page[pages].prev = page->prev;
+ page[pages].prev_slab = pages;
p = (ngx_slab_page_t *) page->prev;
p->next = &page[pages];
@@ -651,6 +653,7 @@
p->slab = NGX_SLAB_PAGE_BUSY;
p->next = NULL;
p->prev = NGX_SLAB_PAGE;
+ p->prev_slab = 0;
p++;
}
@@ -668,7 +671,7 @@
ngx_slab_free_pages(ngx_slab_pool_t *pool, ngx_slab_page_t *page,
ngx_uint_t pages)
{
- ngx_slab_page_t *prev;
+ ngx_slab_page_t *prev, *p;
page->slab = pages--;
@@ -682,6 +685,52 @@
page->next->prev = page->prev;
}
+ /* try to merge the following free slab (if any) */
+
+ p = &page[page->slab];
+ if ((u_char *) p < pool->start
+ && !(p->slab & NGX_SLAB_PAGE_START)
+ && p->next != NULL
+ && (p->prev & NGX_SLAB_PAGE_MASK) == NGX_SLAB_PAGE)
+ {
+ page->slab += p->slab;
+
+ /* remove the following slab from the free list */
+
+ prev = (ngx_slab_page_t *) p->prev;
+ prev->next = p->next;
+ p->next->prev = p->prev;
+
+ ngx_memzero(p, sizeof(ngx_slab_page_t));
+
+ /* adjust prev_slab in the new following slab accordingly */
+ if ((u_char *) (p + p->slab) < pool->start) {
+ p[p->slab].prev_slab = page->slab;
+ }
+ }
+
+ if (page->prev_slab) {
+ /* try to merge the preceding free slab (if any) */
+
+ p = page - page->prev_slab;
+ if (!(p->slab & NGX_SLAB_PAGE_START)
+ && p->next != NULL
+ && (p->prev & NGX_SLAB_PAGE_MASK) == NGX_SLAB_PAGE)
+ {
+ p->slab += page->slab;
+
+ /* adjust prev_slab in the new following slab accordingly */
+ if ((u_char *) (p + p->slab) < pool->start) {
+ p[p->slab].prev_slab = p->slab;
+ }
+
+ ngx_memzero(page, sizeof(ngx_slab_page_t));
+
+ /* skip adding "page" to the free list */
+ return;
+ }
+ }
+
page->prev = (uintptr_t) &pool->free;
page->next = pool->free.next;
diff -r 7586e7b2dbe9 src/core/ngx_slab.h
--- a/src/core/ngx_slab.h Tue Feb 18 17:30:40 2014 +0400
+++ b/src/core/ngx_slab.h Tue May 06 12:32:22 2014 -0700
@@ -19,6 +19,7 @@
uintptr_t slab;
ngx_slab_page_t *next;
uintptr_t prev;
+ uintptr_t prev_slab;
};

4
util/mirror-tarballs
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@ -242,6 +242,10 @@ echo "$info_txt applying the setting_args_invalidates_uri patch for nginx $ver"
patch -p1 < $root/patches/nginx-$ver-setting_args_invalidates_uri.patch || exit 1
echo
echo "$info_txt applying the slab_defrag patch for nginx"
patch -p1 < $root/patches/nginx-$main_ver-slab_defrag.patch || exit 1
echo
rm -f *.patch || exit 1
cd .. || exit 1