From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3337235C1BD for ; Tue, 25 Aug 2026 01:54:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787622890; cv=none; b=SsDw9CCCoodktp2RilJogrky0l3jteiynWO0YHbYc/C2iySJl6e0mw6s8AO/7K+F+UsZ+hGv1Kwcq6vqgI6aHeubSYVPNPhcRFjHK7MaUgJDVESGmzteIHtuFNnwYq5aB8OAdmw/8p3Q1qS+J8PQYDYaiDF4O449Y3UoxEf9Z+c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787622890; c=relaxed/simple; bh=kEOIRXCm6Sk1zQ8P0YOSoproV2K20ATc7llwN41b/iQ=; h=Date:To:From:Subject:Message-Id; b=m0k7rJ+bgbKSEikPOkZqwjnx/SOWdlrUl/gDbYAiJEnXqX5CRegCJGHwzMUReSBLTsEfBX9BCpF/jItyQZXfP72KqTRksCvS/TJQs7sAE27y9csIcEhbzVD9Zf/uLdEnqwFcWYrajAHneq8SOEuHXA5GPayqgf0Vt48m1Np9jao= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=okuu4b92; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="okuu4b92" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 08A0C1F000E9; Tue, 25 Aug 2026 01:54:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1787622888; bh=AUU3ZxzHj+F+R8HrUpzAQhQf+utsUOTETWnGLpT9RcU=; h=Date:To:From:Subject; b=okuu4b92FVQX3nWkm/rM1ajDqp+Bc3bT8JDNUFyQz5S1wz8lfoTsEfKnU3J0cRFM1 A5HI+M/wDvHmaMmI6SfZoFdwbcls/91zJRTjkk5S+5/LRjBxaNGLPQ4YoNgDWFQpPL iFY1nZXjWsHCY/+DQ977VGIIjKygWtYEsZc6aqls= Date: Mon, 24 Aug 2026 18:54:47 -0700 To: mm-commits@vger.kernel.org,youngjun.park@lge.com,shikemeng@huaweicloud.com,nphamcs@gmail.com,kasong@tencent.com,chrisl@kernel.org,baoquan.he@linux.dev,baolin.wang@linux.alibaba.com,baohua@kernel.org,hch@lst.de,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-swap-introduce-struct-swap_io_ctx.patch removed from -mm tree Message-Id: <20260825015448.08A0C1F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/swap: introduce struct swap_io_ctx has been removed from the -mm tree. Its filename was mm-swap-introduce-struct-swap_io_ctx.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Christoph Hellwig Subject: mm/swap: introduce struct swap_io_ctx Date: Mon, 13 Jul 2026 11:33:39 +0200 Generalize the context currently provided by double pointers to struct swap_iocb to an on-stack context. This cleans up the code and prepares for adding more fields and supporting batching multiple folios into a single bio for block-based swap as well. This new swap_io_ctx is required for all functions using it, the old way of allowing a NULL iocb for some callers is removed to keep the interface consistent. To reduce code duplication caused by this, a new swap_cache_read_folio_sync helper is added to consolidate the code to call swap_cache_read_folio with a local swap_io_ctx. The unpug helpers are renamed to use the submit wording as they are generalized. Link: https://lore.kernel.org/20260713093350.2154226-3-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Nhat Pham Cc: Baolin Wang Cc: Baoquan He Cc: Barry Song Cc: Chris Li Cc: Kairui Song Cc: Kemeng Shi Cc: Youngjun Park Signed-off-by: Andrew Morton --- mm/madvise.c | 16 ++++++------ mm/page_io.c | 60 ++++++++++++++++++++++++---------------------- mm/shmem.c | 13 ++++++--- mm/swap.h | 35 +++++++++++--------------- mm/swap_state.c | 53 +++++++++++++++++++++++----------------- mm/vmscan.c | 15 +++++------ mm/zswap.c | 4 ++- 7 files changed, 105 insertions(+), 91 deletions(-) --- a/mm/madvise.c~mm-swap-introduce-struct-swap_io_ctx +++ a/mm/madvise.c @@ -188,7 +188,7 @@ static int swapin_walk_pmd_entry(pmd_t * unsigned long end, struct mm_walk *walk) { struct vm_area_struct *vma = walk->private; - struct swap_iocb *splug = NULL; + struct swap_io_ctx ctx = {}; pte_t *ptep = NULL; spinlock_t *ptl; unsigned long addr; @@ -212,15 +212,15 @@ static int swapin_walk_pmd_entry(pmd_t * pte_unmap_unlock(ptep, ptl); ptep = NULL; - folio = read_swap_cache_async(entry, GFP_HIGHUSER_MOVABLE, - vma, addr, &splug); + folio = read_swap_cache_async(&ctx, entry, GFP_HIGHUSER_MOVABLE, + vma, addr); if (folio) folio_put(folio); } if (ptep) pte_unmap_unlock(ptep, ptl); - swap_read_unplug(splug); + swap_read_submit(&ctx); cond_resched(); return 0; @@ -238,7 +238,7 @@ static void shmem_swapin_range(struct vm XA_STATE(xas, &mapping->i_pages, linear_page_index(vma, start)); pgoff_t end_index = linear_page_index(vma, end) - 1; struct folio *folio; - struct swap_iocb *splug = NULL; + struct swap_io_ctx ctx = {}; rcu_read_lock(); xas_for_each(&xas, folio, end_index) { @@ -257,15 +257,15 @@ static void shmem_swapin_range(struct vm xas_pause(&xas); rcu_read_unlock(); - folio = read_swap_cache_async(entry, mapping_gfp_mask(mapping), - vma, addr, &splug); + folio = read_swap_cache_async(&ctx, entry, + mapping_gfp_mask(mapping), vma, addr); if (folio) folio_put(folio); rcu_read_lock(); } rcu_read_unlock(); - swap_read_unplug(splug); + swap_read_submit(&ctx); } #endif /* CONFIG_SWAP */ --- a/mm/page_io.c~mm-swap-introduce-struct-swap_io_ctx +++ a/mm/page_io.c @@ -248,7 +248,7 @@ static void swap_zeromap_folio_clear(str * We may have stale swap cache pages in memory: notice * them here and get rid of the unnecessary final write. */ -int swap_writeout(struct folio *folio, struct swap_iocb **swap_plug) +int swap_writeout(struct swap_io_ctx *ctx, struct folio *folio) { int ret = 0; @@ -295,7 +295,7 @@ int swap_writeout(struct folio *folio, s } rcu_read_unlock(); - __swap_writepage(folio, swap_plug); + __swap_writepage(ctx, folio); return 0; out_unlock: folio_unlock(folio); @@ -390,9 +390,9 @@ static void sio_write_complete(struct ki mempool_free(sio, sio_pool); } -static void swap_writepage_fs(struct folio *folio, struct swap_iocb **swap_plug) +static void swap_writepage_fs(struct swap_io_ctx *ctx, struct folio *folio) { - struct swap_iocb *sio = swap_plug ? *swap_plug : NULL; + struct swap_iocb *sio = ctx->sio; struct swap_info_struct *sis = __swap_entry_to_info(folio->swap); struct file *swap_file = sis->swap_file; loff_t pos = swap_dev_pos(folio->swap); @@ -403,7 +403,7 @@ static void swap_writepage_fs(struct fol if (sio) { if (sio->iocb.ki_filp != swap_file || sio->iocb.ki_pos + sio->len != pos) { - swap_write_unplug(sio); + swap_write_submit(ctx); sio = NULL; } } @@ -418,12 +418,11 @@ static void swap_writepage_fs(struct fol bvec_set_folio(&sio->bvecs[sio->nr_bvecs], folio, folio_size(folio), 0); sio->len += folio_size(folio); sio->nr_bvecs += 1; - if (sio->nr_bvecs == ARRAY_SIZE(sio->bvecs) || !swap_plug) { - swap_write_unplug(sio); + if (sio->nr_bvecs == ARRAY_SIZE(sio->bvecs)) { + swap_write_submit(ctx); sio = NULL; } - if (swap_plug) - *swap_plug = sio; + ctx->sio = sio; } static void swap_writepage_bdev_sync(struct folio *folio, @@ -463,7 +462,7 @@ static void swap_writepage_bdev_async(st submit_bio(bio); } -void __swap_writepage(struct folio *folio, struct swap_iocb **swap_plug) +void __swap_writepage(struct swap_io_ctx *ctx, struct folio *folio) { struct swap_info_struct *sis = __swap_entry_to_info(folio->swap); @@ -474,7 +473,7 @@ void __swap_writepage(struct folio *foli * is safe. */ if (data_race(sis->flags & SWP_FS_OPS)) - swap_writepage_fs(folio, swap_plug); + swap_writepage_fs(ctx, folio); /* * ->flags can be updated non-atomically, * but that will never affect SWP_SYNCHRONOUS_IO, so the data_race @@ -486,16 +485,20 @@ void __swap_writepage(struct folio *foli swap_writepage_bdev_async(folio, sis); } -void swap_write_unplug(struct swap_iocb *sio) +void swap_write_submit(struct swap_io_ctx *ctx) { + struct swap_iocb *sio = ctx->sio; struct iov_iter from; - struct address_space *mapping = sio->iocb.ki_filp->f_mapping; int ret; + if (!sio) + return; + iov_iter_bvec(&from, ITER_SOURCE, sio->bvecs, sio->nr_bvecs, sio->len); - ret = mapping->a_ops->swap_rw(&sio->iocb, &from); + ret = sio->iocb.ki_filp->f_mapping->a_ops->swap_rw(&sio->iocb, &from); if (ret != -EIOCBQUEUED) sio_write_complete(&sio->iocb, ret); + ctx->sio = NULL; } static void sio_read_complete(struct kiocb *iocb, long ret) @@ -587,18 +590,16 @@ static bool swap_read_folio_zeromap(stru return true; } -static void swap_read_folio_fs(struct folio *folio, struct swap_iocb **plug) +static void swap_read_folio_fs(struct swap_io_ctx *ctx, struct folio *folio) { struct swap_info_struct *sis = __swap_entry_to_info(folio->swap); - struct swap_iocb *sio = NULL; + struct swap_iocb *sio = ctx->sio; loff_t pos = swap_dev_pos(folio->swap); - if (plug) - sio = *plug; if (sio) { if (sio->iocb.ki_filp != sis->swap_file || sio->iocb.ki_pos + sio->len != pos) { - swap_read_unplug(sio); + swap_read_submit(ctx); sio = NULL; } } @@ -613,12 +614,11 @@ static void swap_read_folio_fs(struct fo bvec_set_folio(&sio->bvecs[sio->nr_bvecs], folio, folio_size(folio), 0); sio->len += folio_size(folio); sio->nr_bvecs += 1; - if (sio->nr_bvecs == ARRAY_SIZE(sio->bvecs) || !plug) { - swap_read_unplug(sio); + if (sio->nr_bvecs == ARRAY_SIZE(sio->bvecs)) { + swap_read_submit(ctx); sio = NULL; } - if (plug) - *plug = sio; + ctx->sio = sio; } static void swap_read_folio_bdev_sync(struct folio *folio, @@ -658,7 +658,7 @@ static void swap_read_folio_bdev_async(s submit_bio(bio); } -void swap_read_folio(struct folio *folio, struct swap_iocb **plug) +void swap_read_folio(struct swap_io_ctx *ctx, struct folio *folio) { struct swap_info_struct *sis = __swap_entry_to_info(folio->swap); bool synchronous = sis->flags & SWP_SYNCHRONOUS_IO; @@ -693,7 +693,7 @@ void swap_read_folio(struct folio *folio zswap_folio_swapin(folio); if (data_race(sis->flags & SWP_FS_OPS)) { - swap_read_folio_fs(folio, plug); + swap_read_folio_fs(ctx, folio); } else if (synchronous) { swap_read_folio_bdev_sync(folio, sis); } else { @@ -708,14 +708,18 @@ finish: delayacct_swapin_end(); } -void __swap_read_unplug(struct swap_iocb *sio) +void swap_read_submit(struct swap_io_ctx *ctx) { + struct swap_iocb *sio = ctx->sio; struct iov_iter from; - struct address_space *mapping = sio->iocb.ki_filp->f_mapping; int ret; + if (!sio) + return; + iov_iter_bvec(&from, ITER_DEST, sio->bvecs, sio->nr_bvecs, sio->len); - ret = mapping->a_ops->swap_rw(&sio->iocb, &from); + ret = sio->iocb.ki_filp->f_mapping->a_ops->swap_rw(&sio->iocb, &from); if (ret != -EIOCBQUEUED) sio_read_complete(&sio->iocb, ret); + ctx->sio = NULL; } --- a/mm/shmem.c~mm-swap-introduce-struct-swap_io_ctx +++ a/mm/shmem.c @@ -1597,13 +1597,13 @@ start_over: /** * shmem_writeout - Write the folio to swap + * @ctx: swap I/O context * @folio: The folio to write - * @plug: swap plug * @folio_list: list to put back folios on split * * Move the folio from the page cache to the swap cache. */ -int shmem_writeout(struct folio *folio, struct swap_iocb **plug, +int shmem_writeout(struct swap_io_ctx *ctx, struct folio *folio, struct list_head *folio_list) { struct address_space *mapping = folio->mapping; @@ -1715,7 +1715,7 @@ try_split: shmem_delete_from_page_cache(folio, swp_to_radix_entry(folio->swap)); BUG_ON(folio_mapped(folio)); - error = swap_writeout(folio, plug); + error = swap_writeout(ctx, folio); if (error != AOP_WRITEPAGE_ACTIVATE) { /* folio has been unlocked */ return error; @@ -1754,7 +1754,12 @@ redirty: int shmem_write_folio(struct folio *folio) { - return shmem_writeout(folio, NULL, NULL); + struct swap_io_ctx ctx = {}; + int err; + + err = shmem_writeout(&ctx, folio, NULL); + swap_write_submit(&ctx); + return err; } EXPORT_SYMBOL_GPL(shmem_write_folio); --- a/mm/swap.h~mm-swap-introduce-struct-swap_io_ctx +++ a/mm/swap.h @@ -91,6 +91,10 @@ static inline int mem_cgroup_swappiness( return READ_ONCE(vm_swappiness); } +struct swap_io_ctx { + struct swap_iocb *sio; +}; + #ifdef CONFIG_SWAP #include /* for swp_offset */ #include /* for bio_end_io_t */ @@ -253,17 +257,11 @@ extern void __swap_cluster_free_entries( /* linux/mm/page_io.c */ int sio_pool_init(void); -struct swap_iocb; -void swap_read_folio(struct folio *folio, struct swap_iocb **plug); -void __swap_read_unplug(struct swap_iocb *plug); -static inline void swap_read_unplug(struct swap_iocb *plug) -{ - if (unlikely(plug)) - __swap_read_unplug(plug); -} -void swap_write_unplug(struct swap_iocb *sio); -int swap_writeout(struct folio *folio, struct swap_iocb **swap_plug); -void __swap_writepage(struct folio *folio, struct swap_iocb **swap_plug); +void swap_read_folio(struct swap_io_ctx *ctx, struct folio *folio); +void swap_read_submit(struct swap_io_ctx *ctx); +void swap_write_submit(struct swap_io_ctx *ctx); +int swap_writeout(struct swap_io_ctx *ctx, struct folio *folio); +void __swap_writepage(struct swap_io_ctx *ctx, struct folio *folio); /* linux/mm/swap_state.c */ extern struct address_space swap_space __read_mostly; @@ -330,9 +328,8 @@ void __swap_cache_replace_folio(struct s void show_swap_cache_info(void); void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry, int nr); -struct folio *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, - struct vm_area_struct *vma, unsigned long addr, - struct swap_iocb **plug); +struct folio *read_swap_cache_async(struct swap_io_ctx *ctx, swp_entry_t entry, + gfp_t gfp_mask, struct vm_area_struct *vma, unsigned long addr); struct folio *swap_cluster_readahead(swp_entry_t entry, gfp_t flag, struct mempolicy *mpol, pgoff_t ilx); struct folio *swapin_readahead(swp_entry_t entry, gfp_t flag, @@ -348,7 +345,6 @@ static inline unsigned int folio_swap_fl } #else /* CONFIG_SWAP */ -struct swap_iocb; static inline struct swap_cluster_info *swap_cluster_lock( struct swap_info_struct *si, pgoff_t offset, bool irq) { @@ -394,11 +390,11 @@ static inline void folio_put_swap(struct { } -static inline void swap_read_folio(struct folio *folio, struct swap_iocb **plug) +static inline void swap_read_folio(struct swap_io_ctx *ctx, struct folio *folio) { } -static inline void swap_write_unplug(struct swap_iocb *sio) +static inline void swap_write_submit(struct swap_io_ctx *ctx) { } @@ -440,8 +436,7 @@ static inline void swap_update_readahead { } -static inline int swap_writeout(struct folio *folio, - struct swap_iocb **swap_plug) +static inline int swap_writeout(struct swap_io_ctx *ctx, struct folio *folio) { return 0; } @@ -487,7 +482,7 @@ static inline unsigned int folio_swap_fl #endif /* CONFIG_SWAP */ -int shmem_writeout(struct folio *folio, struct swap_iocb **plug, +int shmem_writeout(struct swap_io_ctx *ctx, struct folio *folio, struct list_head *folio_list); #endif /* _MM_SWAP_H */ --- a/mm/swap_state.c~mm-swap-introduce-struct-swap_io_ctx +++ a/mm/swap_state.c @@ -638,9 +638,9 @@ void swap_update_readahead(struct folio } } -static struct folio *swap_cache_read_folio(swp_entry_t entry, gfp_t gfp, - struct mempolicy *mpol, pgoff_t ilx, - struct swap_iocb **plug, bool readahead) +static struct folio *swap_cache_read_folio(struct swap_io_ctx *ctx, + swp_entry_t entry, gfp_t gfp, struct mempolicy *mpol, + pgoff_t ilx, bool readahead) { struct folio *folio; @@ -654,7 +654,7 @@ static struct folio *swap_cache_read_fol if (IS_ERR_OR_NULL(folio)) return NULL; - swap_read_folio(folio, plug); + swap_read_folio(ctx, folio); if (readahead) { folio_set_readahead(folio); count_vm_event(SWAP_RA); @@ -682,6 +682,7 @@ static struct folio *swap_cache_read_fol struct folio *swapin_sync(swp_entry_t entry, gfp_t gfp, unsigned long orders, struct vm_fault *vmf, struct mempolicy *mpol, pgoff_t ilx) { + struct swap_io_ctx ctx = {}; struct folio *folio; do { @@ -694,7 +695,8 @@ struct folio *swapin_sync(swp_entry_t en if (IS_ERR(folio)) return folio; - swap_read_folio(folio, NULL); + swap_read_folio(&ctx, folio); + swap_read_submit(&ctx); return folio; } @@ -704,9 +706,8 @@ struct folio *swapin_sync(swp_entry_t en * A failure return means that either the page allocation failed or that * the swap entry is no longer in use. */ -struct folio *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, - struct vm_area_struct *vma, unsigned long addr, - struct swap_iocb **plug) +struct folio *read_swap_cache_async(struct swap_io_ctx *ctx, swp_entry_t entry, + gfp_t gfp_mask, struct vm_area_struct *vma, unsigned long addr) { struct swap_info_struct *si; struct mempolicy *mpol; @@ -718,13 +719,24 @@ struct folio *read_swap_cache_async(swp_ return NULL; mpol = get_vma_policy(vma, addr, 0, &ilx); - folio = swap_cache_read_folio(entry, gfp_mask, mpol, ilx, plug, false); + folio = swap_cache_read_folio(ctx, entry, gfp_mask, mpol, ilx, false); mpol_cond_put(mpol); put_swap_device(si); return folio; } +static struct folio *swap_cache_read_folio_sync(swp_entry_t entry, gfp_t gfp, + struct mempolicy *mpol, pgoff_t ilx) +{ + struct swap_io_ctx ctx = {}; + struct folio *folio; + + folio = swap_cache_read_folio(&ctx, entry, gfp, mpol, ilx, false); + swap_read_submit(&ctx); + return folio; +} + static unsigned int __swapin_nr_pages(unsigned long prev_offset, unsigned long offset, int hits, @@ -813,8 +825,8 @@ struct folio *swap_cluster_readahead(swp unsigned long start_offset, end_offset; unsigned long mask; struct swap_info_struct *si = __swap_entry_to_info(entry); + struct swap_io_ctx ctx = {}; struct blk_plug plug; - struct swap_iocb *splug = NULL; swp_entry_t ra_entry; mask = swapin_nr_pages(offset) - 1; @@ -833,17 +845,16 @@ struct folio *swap_cluster_readahead(swp for (offset = start_offset; offset <= end_offset ; offset++) { /* Ok, do the async read-ahead now */ ra_entry = swp_entry(swp_type(entry), offset); - folio = swap_cache_read_folio(ra_entry, gfp_mask, mpol, ilx, - &splug, offset != entry_offset); + folio = swap_cache_read_folio(&ctx, ra_entry, gfp_mask, mpol, + ilx, offset != entry_offset); if (!folio) continue; folio_put(folio); } blk_finish_plug(&plug); - swap_read_unplug(splug); + swap_read_submit(&ctx); skip: - /* The page was likely read above, so no need for plugging here */ - return swap_cache_read_folio(entry, gfp_mask, mpol, ilx, NULL, false); + return swap_cache_read_folio_sync(entry, gfp_mask, mpol, ilx); } static int swap_vma_ra_win(struct vm_fault *vmf, unsigned long *start, @@ -903,8 +914,8 @@ static int swap_vma_ra_win(struct vm_fau static struct folio *swap_vma_readahead(swp_entry_t targ_entry, gfp_t gfp_mask, struct mempolicy *mpol, pgoff_t targ_ilx, struct vm_fault *vmf) { + struct swap_io_ctx ctx = {}; struct blk_plug plug; - struct swap_iocb *splug = NULL; struct folio *folio; pte_t *pte = NULL, pentry; int win; @@ -943,8 +954,8 @@ static struct folio *swap_vma_readahead( if (!si) continue; } - folio = swap_cache_read_folio(entry, gfp_mask, mpol, ilx, - &splug, addr != vmf->address); + folio = swap_cache_read_folio(&ctx, entry, gfp_mask, mpol, ilx, + addr != vmf->address); if (si) put_swap_device(si); if (!folio) @@ -954,12 +965,10 @@ static struct folio *swap_vma_readahead( if (pte) pte_unmap(pte); blk_finish_plug(&plug); - swap_read_unplug(splug); + swap_read_submit(&ctx); skip: /* The folio was likely read above, so no need for plugging here */ - folio = swap_cache_read_folio(targ_entry, gfp_mask, mpol, targ_ilx, - NULL, false); - return folio; + return swap_cache_read_folio_sync(targ_entry, gfp_mask, mpol, targ_ilx); } /** --- a/mm/vmscan.c~mm-swap-introduce-struct-swap_io_ctx +++ a/mm/vmscan.c @@ -617,8 +617,8 @@ typedef enum { /* * pageout is called by shrink_folio_list() for each dirty folio. */ -static pageout_t pageout(struct folio *folio, struct address_space *mapping, - struct swap_iocb **plug, struct list_head *folio_list) +static pageout_t pageout(struct swap_io_ctx *ctx, struct address_space *mapping, + struct folio *folio, struct list_head *folio_list) { int res; @@ -654,9 +654,9 @@ static pageout_t pageout(struct folio *f * the split out folios get added back to folio_list. */ if (shmem_mapping(mapping)) - res = shmem_writeout(folio, plug, folio_list); + res = shmem_writeout(ctx, folio, folio_list); else - res = swap_writeout(folio, plug); + res = swap_writeout(ctx, folio); if (res < 0) handle_write_error(mapping, folio, res); @@ -1066,7 +1066,7 @@ static unsigned int shrink_folio_list(st unsigned int nr_reclaimed = 0, nr_demoted = 0; unsigned int pgactivate = 0; bool do_demote_pass; - struct swap_iocb *plug = NULL; + struct swap_io_ctx ctx = {}; folio_batch_init(&free_folios); memset(stat, 0, sizeof(*stat)); @@ -1394,7 +1394,7 @@ retry: * starts and then write it out here. */ try_to_unmap_flush_dirty(); - switch (pageout(folio, mapping, &plug, folio_list)) { + switch (pageout(&ctx, mapping, folio, folio_list)) { case PAGE_KEEP: goto keep_locked; case PAGE_ACTIVATE: @@ -1582,8 +1582,7 @@ keep: list_splice(&ret_folios, folio_list); count_vm_events(PGACTIVATE, pgactivate); - if (plug) - swap_write_unplug(plug); + swap_write_submit(&ctx); return nr_reclaimed; } --- a/mm/zswap.c~mm-swap-introduce-struct-swap_io_ctx +++ a/mm/zswap.c @@ -992,6 +992,7 @@ static int zswap_writeback_entry(struct struct folio *folio; struct mempolicy *mpol; struct swap_info_struct *si; + struct swap_io_ctx ctx = {}; int ret = 0; /* try to allocate swap cache folio */ @@ -1049,7 +1050,8 @@ static int zswap_writeback_entry(struct folio_set_reclaim(folio); /* start writeback */ - __swap_writepage(folio, NULL); + __swap_writepage(&ctx, folio); + swap_write_submit(&ctx); out: if (ret) { _ Patches currently in -mm which might be from hch@lst.de are