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struct kmem_cache *xfs_log_ticket_cache; /* Local miscellaneous function prototypes */ diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h index d69acf881153..9cc10acf7bcd 100644 --- a/fs/xfs/xfs_log.h +++ b/fs/xfs/xfs_log.h @@ -20,6 +20,8 @@ struct xfs_log_vec { int lv_size; /* size of allocated lv */ }; +extern struct kmem_cache *xfs_log_vec_cache; + #define XFS_LOG_VEC_ORDERED (-1) /* diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 27e9f749c4c7..7e94f9439a8f 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -2222,8 +2222,16 @@ xfs_init_caches(void) if (!xfs_parent_args_cache) goto out_destroy_xmi_cache; + xfs_log_vec_cache = kmem_cache_create("xfs_log_vec", + sizeof(struct xfs_log_vec), + 0, 0, NULL); + if (!xfs_log_vec_cache) + goto out_destroy_args_cache; + return 0; + out_destroy_args_cache: + kmem_cache_destroy(xfs_parent_args_cache); out_destroy_xmi_cache: kmem_cache_destroy(xfs_xmi_cache); out_destroy_xmd_cache: @@ -2286,6 +2294,7 @@ xfs_destroy_caches(void) * destroy caches. */ rcu_barrier(); 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Tue, 25 Jun 2024 11:28:56 -0700 (PDT) From: alexjlzheng@gmail.com X-Google-Original-From: alexjlzheng@tencent.com To: chandan.babu@oracle.com, djwong@kernel.org Cc: david@fromorbit.com, hch@infradead.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, alexjlzheng@tencent.com Subject: [PATCH xfs v2 2/2] xfs: make xfs_log_iovec independent from xfs_log_vec and free it early Date: Wed, 26 Jun 2024 02:28:42 +0800 Message-ID: <20240625182842.1038809-3-alexjlzheng@tencent.com> X-Mailer: git-send-email 2.41.1 In-Reply-To: <20240625182842.1038809-1-alexjlzheng@tencent.com> References: <20240625182842.1038809-1-alexjlzheng@tencent.com> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jinliang Zheng When the contents of the xfs_log_vec/xfs_log_iovec combination are written to iclog, xfs_log_iovec loses its meaning in continuing to exist in memory, because iclog already has a copy of its contents. We only need to keep xfs_log_vec that takes up very little memory to find the xfs_log_item that needs to be added to AIL after we flush the iclog into the disk log space. Because xfs_log_iovec dominates most of the memory usage of the xfs_log_vec/xfs_log_iovec combination, retaining xfs_log_iovec until iclog is flushed into the disk log space and releasing together with xfs_log_vec is a significant waste of memory. This patch separates the memory of xfs_log_iovec from that of xfs_log_vec, and releases the memory of xfs_log_iovec in advance to save memory. Signed-off-by: Jinliang Zheng --- fs/xfs/xfs_log.c | 2 ++ fs/xfs/xfs_log.h | 8 ++++++-- fs/xfs/xfs_log_cil.c | 33 ++++++++++++++++++++------------- 3 files changed, 28 insertions(+), 15 deletions(-) diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index 49e676061f2f..84a01ce61c96 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -2527,6 +2527,8 @@ xlog_write( xlog_write_full(lv, ticket, iclog, &log_offset, &len, &record_cnt, &data_cnt); } + if (lv->lv_flags & XFS_LOG_VEC_DYNAMIC) + kvfree(lv->lv_iovecp); } ASSERT(len == 0); diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h index 9cc10acf7bcd..035fda96bfcc 100644 --- a/fs/xfs/xfs_log.h +++ b/fs/xfs/xfs_log.h @@ -6,6 +6,8 @@ #ifndef __XFS_LOG_H__ #define __XFS_LOG_H__ +#define XFS_LOG_VEC_DYNAMIC (1 << 0) + struct xfs_cil_ctx; struct xfs_log_vec { @@ -17,7 +19,8 @@ struct xfs_log_vec { char *lv_buf; /* formatted buffer */ int lv_bytes; /* accounted space in buffer */ int lv_buf_len; /* aligned size of buffer */ - int lv_size; /* size of allocated lv */ + int lv_size; /* size of allocated iovecp + buf */ + int lv_flags; /* lv flags */ }; extern struct kmem_cache *xfs_log_vec_cache; @@ -42,6 +45,7 @@ static inline void xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, int data_len) { + struct xfs_log_iovec *lvec = lv->lv_iovecp; struct xlog_op_header *oph = vec->i_addr; int len; @@ -71,7 +75,7 @@ xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, vec->i_len = len; /* Catch buffer overruns */ - ASSERT((void *)lv->lv_buf + lv->lv_bytes <= (void *)lv + lv->lv_size); + ASSERT((void *)lv->lv_buf + lv->lv_bytes <= (void *)lvec + lv->lv_size); } /* diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c index f51cbc6405c1..7cc9ed0aa14a 100644 --- a/fs/xfs/xfs_log_cil.c +++ b/fs/xfs/xfs_log_cil.c @@ -219,8 +219,7 @@ static inline int xlog_cil_iovec_space( uint niovecs) { - return round_up((sizeof(struct xfs_log_vec) + - niovecs * sizeof(struct xfs_log_iovec)), + return round_up(niovecs * sizeof(struct xfs_log_iovec), sizeof(uint64_t)); } @@ -279,6 +278,7 @@ xlog_cil_alloc_shadow_bufs( list_for_each_entry(lip, &tp->t_items, li_trans) { struct xfs_log_vec *lv; + struct xfs_log_iovec *lvec; int niovecs = 0; int nbytes = 0; int buf_size; @@ -330,8 +330,8 @@ xlog_cil_alloc_shadow_bufs( * if we have no shadow buffer, or it is too small, we need to * reallocate it. */ - if (!lip->li_lv_shadow || - buf_size > lip->li_lv_shadow->lv_size) { + lv = lip->li_lv_shadow; + if (!lv || buf_size > lv->lv_size) { /* * We free and allocate here as a realloc would copy * unnecessary data. We don't use kvzalloc() for the @@ -339,18 +339,24 @@ xlog_cil_alloc_shadow_bufs( * the buffer, only the log vector header and the iovec * storage. */ - kvfree(lip->li_lv_shadow); - lv = xlog_kvmalloc(buf_size); + if (lv) + kvfree(lv->lv_iovecp); + else + lv = kmem_cache_alloc(xfs_log_vec_cache, + GFP_KERNEL | __GFP_NOFAIL); - memset(lv, 0, xlog_cil_iovec_space(niovecs)); + memset(lv, 0, sizeof(struct xfs_log_vec)); + lvec = xlog_kvmalloc(buf_size); + memset(lvec, 0, xlog_cil_iovec_space(niovecs)); + lv->lv_flags |= XFS_LOG_VEC_DYNAMIC; INIT_LIST_HEAD(&lv->lv_list); lv->lv_item = lip; lv->lv_size = buf_size; if (ordered) lv->lv_buf_len = XFS_LOG_VEC_ORDERED; else - lv->lv_iovecp = (struct xfs_log_iovec *)&lv[1]; + lv->lv_iovecp = lvec; lip->li_lv_shadow = lv; } else { /* same or smaller, optimise common overwrite case */ @@ -366,9 +372,9 @@ xlog_cil_alloc_shadow_bufs( lv->lv_niovecs = niovecs; /* The allocated data region lies beyond the iovec region */ - lv->lv_buf = (char *)lv + xlog_cil_iovec_space(niovecs); + lv->lv_buf = (char *)lv->lv_iovecp + + xlog_cil_iovec_space(niovecs); } - } /* @@ -502,7 +508,7 @@ xlog_cil_insert_format_items( /* reset the lv buffer information for new formatting */ lv->lv_buf_len = 0; lv->lv_bytes = 0; - lv->lv_buf = (char *)lv + + lv->lv_buf = (char *)lv->lv_iovecp + xlog_cil_iovec_space(lv->lv_niovecs); } else { /* switch to shadow buffer! */ @@ -703,7 +709,7 @@ xlog_cil_free_logvec( while (!list_empty(lv_chain)) { lv = list_first_entry(lv_chain, struct xfs_log_vec, lv_list); list_del_init(&lv->lv_list); - kvfree(lv); + kmem_cache_free(xfs_log_vec_cache, lv); } } @@ -1544,7 +1550,8 @@ xlog_cil_process_intents( set_bit(XFS_LI_WHITEOUT, &ilip->li_flags); trace_xfs_cil_whiteout_mark(ilip); len += ilip->li_lv->lv_bytes; - kvfree(ilip->li_lv); + kvfree(ilip->li_lv->lv_iovecp); + kmem_cache_free(xfs_log_vec_cache, ilip->li_lv); ilip->li_lv = NULL; xfs_trans_del_item(lip);