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Provide sf_buf_ref() to optimize refcounting of already allocated
sendfile(2) buffers. Sponsored by: Netflix Sponsored by: Nginx, Inc.
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parent
be71004959
commit
818d40d033
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=269807
sys
@ -201,6 +201,22 @@ sf_buf_free(struct sf_buf *sf)
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mtx_unlock(&sf_buf_lock);
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}
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void
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sf_buf_ref(struct sf_buf *sf)
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{
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#ifdef SFBUF_OPTIONAL_DIRECT_MAP
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if (SFBUF_OPTIONAL_DIRECT_MAP)
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return;
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#endif
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KASSERT(sf->ref_count > 0, ("%s: sf %p not allocated", __func__, sf));
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mtx_lock(&sf_buf_lock);
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sf->ref_count++;
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mtx_unlock(&sf_buf_lock);
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}
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#ifdef SFBUF_PROCESS_PAGE
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/*
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* Run callback function on sf_buf that holds a certain page.
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@ -1993,8 +1993,7 @@ sf_ext_ref(void *arg1, void *arg2)
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struct sendfile_sync *sfs = arg2;
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vm_page_t pg = sf_buf_page(sf);
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/* XXXGL: there should be sf_buf_ref() */
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sf_buf_alloc(sf_buf_page(sf), SFB_NOWAIT);
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sf_buf_ref(sf);
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vm_page_lock(pg);
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vm_page_wire(pg);
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@ -106,6 +106,7 @@ struct sf_buf;
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#ifdef SFBUF
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struct sf_buf *sf_buf_alloc(struct vm_page *, int);
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void sf_buf_free(struct sf_buf *);
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void sf_buf_ref(struct sf_buf *);
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static inline vm_offset_t
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sf_buf_kva(struct sf_buf *sf)
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@ -168,6 +169,11 @@ static inline void
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sf_buf_free(struct sf_buf *sf)
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{
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}
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static inline void
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sf_buf_ref(struct sf_buf *sf)
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{
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}
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#endif /* SFBUF */
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/*
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