Mercurial > hg > nginx
changeset 7985:ec2e6893caaa
Simplified sendfile(SF_NODISKIO) usage.
Starting with FreeBSD 11, there is no need to use AIO operations to preload
data into cache for sendfile(SF_NODISKIO) to work. Instead, sendfile()
handles non-blocking loading data from disk by itself. It still can, however,
return EBUSY if a page is already being loaded (for example, by a different
process). If this happens, we now post an event for the next event loop
iteration, so sendfile() is retried "after a short period", as manpage
recommends.
The limit of the number of EBUSY tolerated without any progress is preserved,
but now it does not result in an alert, since on an idle system event loop
iteration might be very short and EBUSY can happen many times in a row.
Instead, SF_NODISKIO is simply disabled for one call once the limit is
reached.
With this change, sendfile(SF_NODISKIO) is now used automatically as long as
sendfile() is enabled, and no longer requires "aio on;".
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 27 Dec 2021 19:48:33 +0300 |
| parents | ae992b5a27b2 |
| children | f1fcb0fe6975 |
| files | auto/os/freebsd src/core/ngx_buf.h src/core/ngx_connection.h src/core/ngx_module.h src/core/ngx_output_chain.c src/event/ngx_event.h src/http/ngx_http_copy_filter_module.c src/os/unix/ngx_freebsd_sendfile_chain.c |
| diffstat | 8 files changed, 33 insertions(+), 174 deletions(-) [+] |
line wrap: on
line diff
--- a/auto/os/freebsd Mon Dec 27 19:47:05 2021 +0300 +++ b/auto/os/freebsd Mon Dec 27 19:48:33 2021 +0300 @@ -44,12 +44,10 @@ CORE_SRCS="$CORE_SRCS $FREEBSD_SENDFILE_SRCS" fi -if [ $NGX_FILE_AIO = YES ]; then - if [ $osreldate -gt 502103 ]; then - echo " + sendfile()'s SF_NODISKIO found" +if [ $osreldate -gt 1100093 ]; then + echo " + sendfile()'s SF_NODISKIO found" - have=NGX_HAVE_AIO_SENDFILE . auto/have - fi + have=NGX_HAVE_SENDFILE_NODISKIO . auto/have fi # POSIX semaphores
--- a/src/core/ngx_buf.h Mon Dec 27 19:47:05 2021 +0300 +++ b/src/core/ngx_buf.h Mon Dec 27 19:48:33 2021 +0300 @@ -90,9 +90,6 @@ #if (NGX_HAVE_FILE_AIO || NGX_COMPAT) ngx_output_chain_aio_pt aio_handler; -#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT) - ssize_t (*aio_preload)(ngx_buf_t *file); -#endif #endif #if (NGX_THREADS || NGX_COMPAT)
--- a/src/core/ngx_connection.h Mon Dec 27 19:47:05 2021 +0300 +++ b/src/core/ngx_connection.h Mon Dec 27 19:48:33 2021 +0300 @@ -185,7 +185,7 @@ unsigned need_last_buf:1; -#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT) +#if (NGX_HAVE_SENDFILE_NODISKIO || NGX_COMPAT) unsigned busy_count:2; #endif
--- a/src/core/ngx_module.h Mon Dec 27 19:47:05 2021 +0300 +++ b/src/core/ngx_module.h Mon Dec 27 19:48:33 2021 +0300 @@ -41,7 +41,7 @@ #define NGX_MODULE_SIGNATURE_3 "0" #endif -#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT) +#if (NGX_HAVE_SENDFILE_NODISKIO || NGX_COMPAT) #define NGX_MODULE_SIGNATURE_4 "1" #else #define NGX_MODULE_SIGNATURE_4 "0"
--- a/src/core/ngx_output_chain.c Mon Dec 27 19:47:05 2021 +0300 +++ b/src/core/ngx_output_chain.c Mon Dec 27 19:48:33 2021 +0300 @@ -29,10 +29,6 @@ static ngx_inline ngx_int_t ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf); -#if (NGX_HAVE_AIO_SENDFILE) -static ngx_int_t ngx_output_chain_aio_setup(ngx_output_chain_ctx_t *ctx, - ngx_file_t *file); -#endif static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in); static ngx_int_t ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx, @@ -283,12 +279,6 @@ buf->in_file = 0; } -#if (NGX_HAVE_AIO_SENDFILE) - if (ctx->aio_preload && buf->in_file) { - (void) ngx_output_chain_aio_setup(ctx, buf->file); - } -#endif - if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) { return 0; } @@ -301,28 +291,6 @@ } -#if (NGX_HAVE_AIO_SENDFILE) - -static ngx_int_t -ngx_output_chain_aio_setup(ngx_output_chain_ctx_t *ctx, ngx_file_t *file) -{ - ngx_event_aio_t *aio; - - if (file->aio == NULL && ngx_file_aio_init(file, ctx->pool) != NGX_OK) { - return NGX_ERROR; - } - - aio = file->aio; - - aio->data = ctx->filter_ctx; - aio->preload_handler = ctx->aio_preload; - - return NGX_OK; -} - -#endif - - static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in)
--- a/src/event/ngx_event.h Mon Dec 27 19:47:05 2021 +0300 +++ b/src/event/ngx_event.h Mon Dec 27 19:48:33 2021 +0300 @@ -147,10 +147,6 @@ ngx_fd_t fd; -#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT) - ssize_t (*preload_handler)(ngx_buf_t *file); -#endif - #if (NGX_HAVE_EVENTFD) int64_t res; #endif
--- a/src/http/ngx_http_copy_filter_module.c Mon Dec 27 19:47:05 2021 +0300 +++ b/src/http/ngx_http_copy_filter_module.c Mon Dec 27 19:48:33 2021 +0300 @@ -19,10 +19,6 @@ static void ngx_http_copy_aio_handler(ngx_output_chain_ctx_t *ctx, ngx_file_t *file); static void ngx_http_copy_aio_event_handler(ngx_event_t *ev); -#if (NGX_HAVE_AIO_SENDFILE) -static ssize_t ngx_http_copy_aio_sendfile_preload(ngx_buf_t *file); -static void ngx_http_copy_aio_sendfile_event_handler(ngx_event_t *ev); -#endif #endif #if (NGX_THREADS) static ngx_int_t ngx_http_copy_thread_handler(ngx_thread_task_t *task, @@ -128,9 +124,6 @@ #if (NGX_HAVE_FILE_AIO) if (ngx_file_aio && clcf->aio == NGX_HTTP_AIO_ON) { ctx->aio_handler = ngx_http_copy_aio_handler; -#if (NGX_HAVE_AIO_SENDFILE) - ctx->aio_preload = ngx_http_copy_aio_sendfile_preload; -#endif } #endif @@ -207,81 +200,6 @@ ngx_http_run_posted_requests(c); } - -#if (NGX_HAVE_AIO_SENDFILE) - -static ssize_t -ngx_http_copy_aio_sendfile_preload(ngx_buf_t *file) -{ - ssize_t n; - static u_char buf[1]; - ngx_event_aio_t *aio; - ngx_http_request_t *r; - ngx_output_chain_ctx_t *ctx; - - aio = file->file->aio; - r = aio->data; - - if (r->aio) { - /* - * tolerate sendfile() calls if another operation is already - * running; this can happen due to subrequests, multiple calls - * of the next body filter from a filter, or in HTTP/2 due to - * a write event on the main connection - */ - - return NGX_AGAIN; - } - - n = ngx_file_aio_read(file->file, buf, 1, file->file_pos, NULL); - - if (n == NGX_AGAIN) { - aio->handler = ngx_http_copy_aio_sendfile_event_handler; - - r->main->blocked++; - r->aio = 1; - - ctx = ngx_http_get_module_ctx(r, ngx_http_copy_filter_module); - ctx->aio = 1; - } - - return n; -} - - -static void -ngx_http_copy_aio_sendfile_event_handler(ngx_event_t *ev) -{ - ngx_event_aio_t *aio; - ngx_connection_t *c; - ngx_http_request_t *r; - - aio = ev->data; - r = aio->data; - c = r->connection; - - r->main->blocked--; - r->aio = 0; - ev->complete = 0; - -#if (NGX_HTTP_V2) - - if (r->stream) { - /* - * for HTTP/2, update write event to make sure processing will - * reach the main connection to handle sendfile() preload - */ - - c->write->ready = 1; - c->write->active = 0; - } - -#endif - - c->write->handler(c->write); -} - -#endif #endif
--- a/src/os/unix/ngx_freebsd_sendfile_chain.c Mon Dec 27 19:47:05 2021 +0300 +++ b/src/os/unix/ngx_freebsd_sendfile_chain.c Mon Dec 27 19:48:33 2021 +0300 @@ -32,23 +32,22 @@ ngx_chain_t * ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) { - int rc, flags; - off_t send, prev_send, sent; - size_t file_size; - ssize_t n; - ngx_uint_t eintr, eagain; - ngx_err_t err; - ngx_buf_t *file; - ngx_event_t *wev; - ngx_chain_t *cl; - ngx_iovec_t header, trailer; - struct sf_hdtr hdtr; - struct iovec headers[NGX_IOVS_PREALLOCATE]; - struct iovec trailers[NGX_IOVS_PREALLOCATE]; -#if (NGX_HAVE_AIO_SENDFILE) - ngx_uint_t ebusy; - ngx_event_aio_t *aio; + int rc, flags; + off_t send, prev_send, sent; + size_t file_size; + ssize_t n; + ngx_err_t err; + ngx_buf_t *file; + ngx_uint_t eintr, eagain; +#if (NGX_HAVE_SENDFILE_NODISKIO) + ngx_uint_t ebusy; #endif + ngx_event_t *wev; + ngx_chain_t *cl; + ngx_iovec_t header, trailer; + struct sf_hdtr hdtr; + struct iovec headers[NGX_IOVS_PREALLOCATE]; + struct iovec trailers[NGX_IOVS_PREALLOCATE]; wev = c->write; @@ -77,11 +76,6 @@ eagain = 0; flags = 0; -#if (NGX_HAVE_AIO_SENDFILE && NGX_SUPPRESS_WARN) - aio = NULL; - file = NULL; -#endif - header.iovs = headers; header.nalloc = NGX_IOVS_PREALLOCATE; @@ -90,7 +84,7 @@ for ( ;; ) { eintr = 0; -#if (NGX_HAVE_AIO_SENDFILE) +#if (NGX_HAVE_SENDFILE_NODISKIO) ebusy = 0; #endif prev_send = send; @@ -179,9 +173,8 @@ sent = 0; -#if (NGX_HAVE_AIO_SENDFILE) - aio = file->file->aio; - flags = (aio && aio->preload_handler) ? SF_NODISKIO : 0; +#if (NGX_HAVE_SENDFILE_NODISKIO) + flags = (c->busy_count <= 2) ? SF_NODISKIO : 0; #endif rc = sendfile(file->file->fd, c->fd, file->file_pos, @@ -199,7 +192,7 @@ eintr = 1; break; -#if (NGX_HAVE_AIO_SENDFILE) +#if (NGX_HAVE_SENDFILE_NODISKIO) case NGX_EBUSY: ebusy = 1; break; @@ -252,41 +245,30 @@ in = ngx_chain_update_sent(in, sent); -#if (NGX_HAVE_AIO_SENDFILE) +#if (NGX_HAVE_SENDFILE_NODISKIO) if (ebusy) { if (sent == 0) { c->busy_count++; - if (c->busy_count > 2) { - ngx_log_error(NGX_LOG_ALERT, c->log, 0, - "sendfile(%V) returned busy again", - &file->file->name); - - c->busy_count = 0; - aio->preload_handler = NULL; - - send = prev_send; - continue; - } + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, + "sendfile() busy, count:%d", c->busy_count); } else { c->busy_count = 0; } - n = aio->preload_handler(file); - - if (n > 0) { - send = prev_send + sent; - continue; + if (wev->posted) { + ngx_delete_posted_event(wev); } + ngx_post_event(wev, &ngx_posted_next_events); + + wev->ready = 0; return in; } - if (flags == SF_NODISKIO) { - c->busy_count = 0; - } + c->busy_count = 0; #endif