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@ -1,183 +0,0 @@
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From f3bcc0bcfb6eda3f4874fe2531d546ba724c518c Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Lubo=C5=A1=20Uhliarik?= <luhliari@redhat.com>
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Date: Wed, 12 Jun 2024 12:49:28 +0200
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Subject: [PATCH] Optimized chain link usage
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Previously chain links could sometimes be dropped instead of being reused,
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which could result in increased memory consumption during long requests.
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---
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src/core/ngx_output_chain.c | 10 ++++++++--
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src/http/modules/ngx_http_grpc_module.c | 5 ++++-
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.../modules/ngx_http_gunzip_filter_module.c | 18 ++++++++++++++----
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src/http/modules/ngx_http_gzip_filter_module.c | 10 +++++++---
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src/http/modules/ngx_http_ssi_filter_module.c | 8 ++++++--
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src/http/modules/ngx_http_sub_filter_module.c | 8 ++++++--
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6 files changed, 45 insertions(+), 14 deletions(-)
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diff --git a/src/core/ngx_output_chain.c b/src/core/ngx_output_chain.c
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index 5c3dbe8..4aa1b02 100644
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--- a/src/core/ngx_output_chain.c
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+++ b/src/core/ngx_output_chain.c
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@@ -121,7 +121,10 @@ ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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ngx_debug_point();
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- ctx->in = ctx->in->next;
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+ cl = ctx->in;
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+ ctx->in = cl->next;
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+
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+ ngx_free_chain(ctx->pool, cl);
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continue;
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}
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@@ -207,7 +210,10 @@ ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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/* delete the completed buf from the ctx->in chain */
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if (ngx_buf_size(ctx->in->buf) == 0) {
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- ctx->in = ctx->in->next;
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+ cl = ctx->in;
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+ ctx->in = cl->next;
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+
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+ ngx_free_chain(ctx->pool, cl);
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}
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cl = ngx_alloc_chain_link(ctx->pool);
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diff --git a/src/http/modules/ngx_http_grpc_module.c b/src/http/modules/ngx_http_grpc_module.c
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index 53bc547..9f13089 100644
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--- a/src/http/modules/ngx_http_grpc_module.c
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+++ b/src/http/modules/ngx_http_grpc_module.c
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@@ -1230,7 +1230,7 @@ ngx_http_grpc_body_output_filter(void *data, ngx_chain_t *in)
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ngx_buf_t *b;
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ngx_int_t rc;
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ngx_uint_t next, last;
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- ngx_chain_t *cl, *out, **ll;
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+ ngx_chain_t *cl, *out, *ln, **ll;
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ngx_http_upstream_t *u;
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ngx_http_grpc_ctx_t *ctx;
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ngx_http_grpc_frame_t *f;
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@@ -1458,7 +1458,10 @@ ngx_http_grpc_body_output_filter(void *data, ngx_chain_t *in)
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last = 1;
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}
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+ ln = in;
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in = in->next;
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+
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+ ngx_free_chain(r->pool, ln);
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}
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ctx->in = in;
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diff --git a/src/http/modules/ngx_http_gunzip_filter_module.c b/src/http/modules/ngx_http_gunzip_filter_module.c
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index c1341f5..5d170a1 100644
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--- a/src/http/modules/ngx_http_gunzip_filter_module.c
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+++ b/src/http/modules/ngx_http_gunzip_filter_module.c
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@@ -333,6 +333,8 @@ static ngx_int_t
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ngx_http_gunzip_filter_add_data(ngx_http_request_t *r,
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ngx_http_gunzip_ctx_t *ctx)
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{
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+ ngx_chain_t *cl;
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+
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if (ctx->zstream.avail_in || ctx->flush != Z_NO_FLUSH || ctx->redo) {
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return NGX_OK;
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}
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@@ -344,8 +346,11 @@ ngx_http_gunzip_filter_add_data(ngx_http_request_t *r,
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return NGX_DECLINED;
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}
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- ctx->in_buf = ctx->in->buf;
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- ctx->in = ctx->in->next;
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+ cl = ctx->in;
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+ ctx->in_buf = cl->buf;
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+ ctx->in = cl->next;
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+
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+ ngx_free_chain(r->pool, cl);
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ctx->zstream.next_in = ctx->in_buf->pos;
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ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos;
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@@ -374,6 +379,7 @@ static ngx_int_t
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ngx_http_gunzip_filter_get_buf(ngx_http_request_t *r,
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ngx_http_gunzip_ctx_t *ctx)
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{
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+ ngx_chain_t *cl;
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ngx_http_gunzip_conf_t *conf;
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if (ctx->zstream.avail_out) {
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@@ -383,8 +389,12 @@ ngx_http_gunzip_filter_get_buf(ngx_http_request_t *r,
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conf = ngx_http_get_module_loc_conf(r, ngx_http_gunzip_filter_module);
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if (ctx->free) {
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- ctx->out_buf = ctx->free->buf;
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- ctx->free = ctx->free->next;
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+
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+ cl = ctx->free;
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+ ctx->out_buf = cl->buf;
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+ ctx->free = cl->next;
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+
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+ ngx_free_chain(r->pool, cl);
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ctx->out_buf->flush = 0;
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diff --git a/src/http/modules/ngx_http_gzip_filter_module.c b/src/http/modules/ngx_http_gzip_filter_module.c
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index b8c5ccc..1d17a6d 100644
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--- a/src/http/modules/ngx_http_gzip_filter_module.c
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+++ b/src/http/modules/ngx_http_gzip_filter_module.c
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@@ -978,10 +978,14 @@ static void
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ngx_http_gzip_filter_free_copy_buf(ngx_http_request_t *r,
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ngx_http_gzip_ctx_t *ctx)
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{
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- ngx_chain_t *cl;
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+ ngx_chain_t *cl, *ln;
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+
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+ for (cl = ctx->copied; cl; /* void */) {
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+ ln = cl;
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+ cl = cl->next;
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- for (cl = ctx->copied; cl; cl = cl->next) {
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- ngx_pfree(r->pool, cl->buf->start);
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+ ngx_pfree(r->pool, ln->buf->start);
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+ ngx_free_chain(r->pool, ln);
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}
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ctx->copied = NULL;
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diff --git a/src/http/modules/ngx_http_ssi_filter_module.c b/src/http/modules/ngx_http_ssi_filter_module.c
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index 6737965..a55f6e5 100644
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--- a/src/http/modules/ngx_http_ssi_filter_module.c
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+++ b/src/http/modules/ngx_http_ssi_filter_module.c
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@@ -455,9 +455,13 @@ ngx_http_ssi_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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while (ctx->in || ctx->buf) {
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if (ctx->buf == NULL) {
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- ctx->buf = ctx->in->buf;
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- ctx->in = ctx->in->next;
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+
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+ cl = ctx->in;
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+ ctx->buf = cl->buf;
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+ ctx->in = cl->next;
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ctx->pos = ctx->buf->pos;
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+
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+ ngx_free_chain(r->pool, cl);
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}
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if (ctx->state == ssi_start_state) {
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diff --git a/src/http/modules/ngx_http_sub_filter_module.c b/src/http/modules/ngx_http_sub_filter_module.c
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index 6d3de59..456bb27 100644
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--- a/src/http/modules/ngx_http_sub_filter_module.c
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+++ b/src/http/modules/ngx_http_sub_filter_module.c
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@@ -335,9 +335,13 @@ ngx_http_sub_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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while (ctx->in || ctx->buf) {
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if (ctx->buf == NULL) {
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- ctx->buf = ctx->in->buf;
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- ctx->in = ctx->in->next;
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+
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+ cl = ctx->in;
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+ ctx->buf = cl->buf;
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+ ctx->in = cl->next;
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ctx->pos = ctx->buf->pos;
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+
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+ ngx_free_chain(r->pool, cl);
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}
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if (ctx->buf->flush || ctx->buf->recycled) {
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--
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2.44.0
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